I figured it was finally time to ask someone else because I can't figure it out. I have been reading through some similar old posts and can't find anything exactly like the problem I am having.
I have an 84 Grand Prix with the stock 305. I only started having problems when I swapped out a manual choke edelbrock 600 cfm carb for an electric choke edelbrock 600 cfm. (I traded the manual choke even up for a Demon 750). I first noticed a problem when working my part time job delivering pizza, so the motor was warm, and the idle became very erratic, then it died. I tried to start it, it would start, then instantly die. I noticed the carb was pretty hot to the touch, and thought that might be a problem. I had to leave the car where it was until after work, about 3 hours later, and it started right up and ran without a problem. It eventually started getting worse, where it start missing badly, even driving 70 down the highway, but only intermittently, usually for about 15-20 seconds out of a 50 minute drive on the highway, always after it warms up. It seems to be worse if I let it idle for too long. I never had to problem before I swapped the carb, So to make a long story short I swapped in another identical carb, but with a 1" spacer, and change the wires, plugs, vacuum lines, fuel lines and fuel filter at the same time. It seemed like it might have been better at first, but now my car is sitting dead just outside of town, where it stalled and wont start again, and the carb is cold to the touch this time. Another tidbit, if it stalled while running, and I floored the gas, it would start again and I would be able to drive it.. so I thought it was a gas problem. I have now added some Heet to the gas, but I haven't been able to start the car to see if it helps, but since I can't start it, I doubt that is the problem. I think it is getting gas, because I put another fuel filter on, and it is already full, even though the car won't start. A Napa guy stopped to see if I needed anything, and I relayed a little of my story to him, and he suggested the ignition control module since it is mostly dying when the engine is warm, but i replaced the whole distributor with a new one from summit about a year ago. The engine has 130k miles on, but it still runs really strong, especially for a 305. A guy at work thinks the engine is probably just shot, or maybe has a bad gasket, either intake or head. I put a performer intake on about a year ago as well, with new gaskets, but haven't touched the heads. I do have a 350 I plan on putting in, but it wasn't something I wanted to tackle when it was 20 degrees outside... I was hoping you guys could point me in the right direction. I know this is long, but I didn't want to leave anything out..
I have an 84 Grand Prix with the stock 305. I only started having problems when I swapped out a manual choke edelbrock 600 cfm carb for an electric choke edelbrock 600 cfm. (I traded the manual choke even up for a Demon 750). I first noticed a problem when working my part time job delivering pizza, so the motor was warm, and the idle became very erratic, then it died. I tried to start it, it would start, then instantly die. I noticed the carb was pretty hot to the touch, and thought that might be a problem. I had to leave the car where it was until after work, about 3 hours later, and it started right up and ran without a problem. It eventually started getting worse, where it start missing badly, even driving 70 down the highway, but only intermittently, usually for about 15-20 seconds out of a 50 minute drive on the highway, always after it warms up. It seems to be worse if I let it idle for too long. I never had to problem before I swapped the carb, So to make a long story short I swapped in another identical carb, but with a 1" spacer, and change the wires, plugs, vacuum lines, fuel lines and fuel filter at the same time. It seemed like it might have been better at first, but now my car is sitting dead just outside of town, where it stalled and wont start again, and the carb is cold to the touch this time. Another tidbit, if it stalled while running, and I floored the gas, it would start again and I would be able to drive it.. so I thought it was a gas problem. I have now added some Heet to the gas, but I haven't been able to start the car to see if it helps, but since I can't start it, I doubt that is the problem. I think it is getting gas, because I put another fuel filter on, and it is already full, even though the car won't start. A Napa guy stopped to see if I needed anything, and I relayed a little of my story to him, and he suggested the ignition control module since it is mostly dying when the engine is warm, but i replaced the whole distributor with a new one from summit about a year ago. The engine has 130k miles on, but it still runs really strong, especially for a 305. A guy at work thinks the engine is probably just shot, or maybe has a bad gasket, either intake or head. I put a performer intake on about a year ago as well, with new gaskets, but haven't touched the heads. I do have a 350 I plan on putting in, but it wasn't something I wanted to tackle when it was 20 degrees outside... I was hoping you guys could point me in the right direction. I know this is long, but I didn't want to leave anything out..
