Question about 1996 Chevrolet Camaro

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I have a 1996 Chevy Express 1500 with a 5.7L engine with 94,000 miles on it. It has multiple missfires. I first changed spark plugs, wires, distributor cap, rotor. I also have flushed the fuel lines and replaced the fuel filter and had the injectors cleaned with professional cleaning solution by a mechanic. The problem went away for about 10 miles then progressively went back to where it was. I replaced the egr valve and that made things worse. What next? Any suggestions would be most helpful.

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If I were you I would either send it to the dealership and have them figure it out. The guys over at Chevy have the computers and the training to deal with their cars.
Or you may want to consider trading it in due to its age.
But if you want to tackle this on your own you will need some help, Someone who can hook you up with info from all-data, a good scan-tool so you can look at live data, run component testing, and look for any codes that may be stored.
You have to know that the engine is sound. Run a compression test, look at Everything. Look at the exhaust system, the fuel system, everything.
The problem does sound like it has to do with the emission system but that could be anything. The OBD2 cars are becoming more and more complex every year. You could need new CATs, fuel injectors, fuel pump service, or any of the hundred of things that can fail when they get old. Good-luck

Posted on May 28, 2010

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Posted on Jan 02, 2017

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