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Had a series of diagnostics run by an ASE certified mechanic including a vacuum leak test and was told the Optispark needs to be replaced. Cylinders 1 and 2 are not firing properly. He gave me a price for an AC Delco Optispark for 750.00, ouch. I found the same part number for the AC Delco part...

Does anyone know what would cause code P0300 (intermittent/random misfire) to come up on a diagnostic? I had a diagnostic done about an hour ago since I had a check engine light on and have had issues recently with a rough idle (only once the engine comes up to temp). Please let me know if...

Thanks for the info. I cannot locate any vacuum leaks and have replaced several ignition/fuel system parts. Please review my previous posting for the parts that have been replaced and systems checks performed. Maybe that will help explaining the issues I am having and the reason I think new O2...

Can someone please let me know how many O2 sensors there are on a '96 and their locations. I am experiencing a rough idle and considering replacing all of the O2 sensors.

My buddy, also a mechanic, has tested the fuel pressure but has not run a compression test. He also has a scan tester that is not pulling up any codes. I will ask him to run further diagnostics and report any abnormalities. Appreciate your comments and hope to get this solved soon as I am very...

Thanks for the info on the injectors. I might try new o2 sensors first since it was a California car until I bought it and brought it to Denver. I'm thinking the extreme change in altitude might be an issue with the old sensors. Let me know if you still think I should consider fuel injectors first.

Cannot locate any vacuum leaks and the fuel pressure is good. The check engine light comes on peridically and the motor has 137K.

My '96 idles rough once up to temp. Replaced the fuel pump, fuel filter, EGR valve, installed new plugs and plug wires, new fuel injection pressure regulator and still idles rough. Think the o2 sensors may be next, your thoughts will certainly be appreciated.

My '96 idles rough once up to temp. Replaced the fuel pump, fuel filter, EGR valve, installed new plugs and plug wires, new fuel injection pressure regulator and still idles rough. Think the o2 sensors may be next, your thoughts will certainly be appreciated.