Hi:
If there is no check engine, the miss must not be too bad or it should kick the light. Have you checked for vacuum leaks? Also, when was the last tune up? It could be an ignition wire with too much resistance or a weak plug.

Let me know if you have other questions.

Joe

Answered by Jacobandnickolas (expert)
57,318 answers provided

I did the sprake plugs on it and it stop running rough.But now I have a vacuum leak that I need to look for.And before the engine light was on (02 senors)replaced both turn the light off and in a day it's back on with the 2-bank
02 senor.Will a vacuum leak make the light go on or is it a cat,or egr?

Thanks for the help.

Response from ryzan32
1 question asked

Hi:
The EGR will kick on its own code in the computer, so I would say no to that. Also, does the pressure from the exhaust seem to be normal or weak? Can you hear any rattling or hissing from the exhaust? If there is a large enough vacuum leak (intake) or exhaust manifold leak it could be causing the O2 sensor to kick the light on. It will recognize the exhaust as being saturated.

Let me know if this helps.

Joe

Answered by Jacobandnickolas (expert)
57,318 answers provided

I dont hear anything from the exhaust sound like the intake.I'll get to it in the next few days see what I can find,I'll let you know.And Thanks again for the help.

Response from ryzan32
1 question asked