my 87 olds cutlass supreme is still running like sh*t. so far ive replaced the distributor, wires, plugs, fuel filter, air filter, and the pcv is clean. whats happening is it idles half *ss ok but as soon as its in gear it boggs right out. i triied adjusting mixture screws and from what i know you snug them up then back it off until the rpm or vac raises then lowers, then return them to where the rpm or vac is the highest. i used a vac gauge and listened to the rpm but to be honest after i backed them out about 2 turns i never noticed any change, even after continuing to back them out about 8-10 turns...im surprised they didnt fall out. i remember triing to adjust these before on another 305 i had and the same thing happened. as is i have about 20 inches of vac and its steady. (got a vid if you wanna see it) another thing i noticed was when i was spraying brake cleaner everywhere to try and locate a vac leak (which i didnt) when i sprayed the little valve thing that sits inside the air breather and has the 2 vac lines underniegth it, the motor would run smooth until i stopped. i triied disconnecting it and plugging the vac line from the carb but no difference. i also timed it to 8 degrees. im at a complete lose as to what else it could be...i also removed the fuel line and had someone crank it over and it has good pressure, also my accel. pump is spraying 2 strong jets into the carb. carbs not lose. this is something that seemed to just happen all of a sudden too so there wasnt anything i could kinda blame it on. if theres ANYTHING else anyone can think of i appreciate it immensly!!! another thing i did was dis-connected the battery to reset the computer. could it have anything to do with my egr? i also dis-connected that and plugged the line but it never made any difference and the diaphram still moves. PLEASE HELP before i go an buy a Mustang!!!