Ever since I started daily driving my 85 Monte Carlo LS with the stock 305 it has had engine issues, specifically it idles horribly and combined MPG is about 5-6. Finally got fed up with it this month and replaced the electric Q-Jet (whose ECM is completely fried) with a proper remanufactured mechanical one off an '80 G30 Chevy van. After endlessly tweaking the idle speeds and mixture screws and making sure there were no vacuum leaks, it still runs terribly at idle and shakes every couple seconds, though not as noticible when I am moving. I cleaned and wire brushed the intake and carb before I installed them, it is getting fuel (though in what capacity/pressure I am not sure) and neither carb ever stalled on me. It also used to (a while before the carb swap) start with a couple pumps on the gas, but now no matter where I am or how warm the motor is I have to hold my foot to the floor while I crank for it to catch at all. The engine is a Goodwrench installed professionally by the previous owner in 2002, as it sits now it has about 55-60k on the block. When I bought it about a year ago I replaced the cap and rotor, spark plugs, fuel filter, radiator, radiator hoses, gas tank, changed the oil, and recently put in some dry gas to get rid of any water left in the tank. At this point I am considering taking it to my local mechanic to see what he wants to root out the problem, since I am quite sick of spending hours on end with the engine on trying to adjust it. All emissions equipment spare the vapor canister and PCV have been totally eliminated from this setup since the older carb doesn't support them.
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