260 v8 1978 cutlass engine problems... :)

[lolatlowqualityparts]

hello!
i posted this in olds, but i wanted more publicity. so i post here 🙂

i had some bad chances on the tollway recently and one of my steering tierods popped out so i had to replace it, i then procceeded to replace the other, after of course, my car was towed home.
we had the car sitting here on jacks for about 3 or 4 days, so the engine was tilted on an angle for that long, if it makes any effect.
car has been running great for quite a while .. until now
after fixing the steering tie rods i fire the car up.
t runs in a semi rough way, but i immediately noticed it since i hear the car idle every day.

rev the engine and it stay revving just fine. as soon as i let off the throttle the engine continues to decellerate, but instead of stopping at idle speed, it keeps decreasing in throttle and stalls.
when the throttle gets low you can give it more gas and it will rev just fine.
if i keep it at a low RPM, via my foot on the gas, the car stays running.
but letting it come down itself from a rev it will just stall out.

i replaced the entire carb less than a year ago. its a holley remanufactured 2 barrel rochester.
bought a carb rebuilt kit at autzone ... which didnt even have that many parts. and replace the accelerator pump.
no help.
please help 🙂

 

[markiv427]

carb adjust

i would first check for vacuum leaks. did you backfire & blow off a vacuum hose? i would then re-adjust the idle mixture-2screws at extreme bottom front of carburetor. then reset idle speed screw which holds throttle lever partially open. air cleaner and PCV hoses must be in place for smooth idle