Engine Performance problem
1998 Chevy Venture 6 cyl Front Wheel Drive Automatic 190000 miles
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Greetings; my 1998 venture runs good cold but as soon as it warms up it begins to shake goes rich and shuts off. It now has a check engine light. Dealer said they had to replace o2 sensors a $400.00 car still does the same thing. Dealer has had the vehicle now for 4 weeks and can not seem to find out what is wrong. Any suggestion please?
By the way fuel pump, wiring harness, many sensors have been replaced. This has been acting up for sometime but now has really gotton bad.

well the best thing to do right now is go to autozone and have your computer scanned for free. then bring the codes back to us and we'll figure out what you need to do

Greetings and thank you for the advive. Closest auto zone is several hours away. Car is not drivable the way it is. The Problem is trying to isolate the problem. Codes that are being sent out of computer are not the problem accorind to the tech that worked on it. He told me they do not have a clue as to what is going on. Tech has replaced several other sensors that computer said was bad no help. Please do you have any other ideas?????? Nathan

the tech that worked on it could be wrong, or just trying to make some money for the shop or himself, this is why it is important to scan the codes, he could be telling you anything,, also if you cant do that , then you will have to start from the basics, fuel pressure regulator, engine coolant temp sensor,plugs ,wires,throttle position sensor

i would check vacuum too.