I would guess one of three things is your problem . 1) is as mentioned by greg_margo is the egr could be stickin or not getting vaccum .2) is the iac ( intack control valve) located n your tbi carb base right rear corner of carb . or your carb base gasket is bad seen this many times with th early 90's caprice weather its a 4.3 5.0 or 5.7litre engine . worked n many of these and still have do as I work for a co. that still has one with over 400,00 mile and still running strong same engine 5.0
SOURCE: Car starts fine..Idle is fast...stalls after car warms up
Check for vacuum leaks. Also try cleaning the ISV.
If that doesnt work go to vwvortex.com and post your issue there
SOURCE: Rough idle and acceleration on 1998 Chevrolet Silverado 5.0
Bad EGR valve comes to mind here. Assuming the plugs are good, the EGR valve woiuld be what I'd look at.
SOURCE: 93 chevy lumina euro won't stay running
sounds like it could be a fuel injector shorting out. have to get it hot, pull off the plenum and check the resistance in each injector. if any injector has bad resistance, replace it. when an injector shorts out on these particular vehicles, it shorts out the whole injection circuit. and when it cools off the resistance goes back up and it will run ok. i think the correct resistance should be about 13 ohms.
SOURCE: 1991 deville idling very ruff
Hi you should change the coolant temp sensor this is a white sensor on top of the intake and is part ot the computer system.
SOURCE: 89' honda civic lx dies after 10 minutes or warms up?
it is probably your distributer. It has a internal amplifier and when it gets hot, it quits working.
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