I have a 2002 saturn sl sohc, and when its at idle you can herea bad misfire sound coming from the exhuast, there is no service engine soon light, it has new plugs and wires, new egr valve and etc. the rpm guage idles smooth also, any help would be much appreciated.

Bad valve, bad plugwire, bad coil pack, oil sitting in the plug valley? Guess you need to check a few things out. RPM gauge?Edited by: sw2cam

KingQuad450 ...

I see you did plugs and wires ... hope you DID NOT</span></span> put platinum plugs in there...

I missed the plug wires sorry .... hope you went to your nearest SATURN dealer for plugs. Hope you gapped them.

ya, it has ac delco plugs gapped at manufacturer''s setting.

AC Delco .... bought from a Saturn Dealer? Or NGK bought at a SATURN dealer.

its not the plugs, it has a puff puff pop noise coming from the tailpipe, started off not so loud but has only gotten louder. im starting to lean toward the burnt valve possibility.

OK - Sounds like your next step is a compression check ...

Bad valve, bad coilpack?

Still, guess you need to check a few things out. RPM gauge?

what i meant by rpm gauge was that my rpm''s do not fluctuate at idle, basically the car runs fine except for that wierd puff puff pop exhaust noise, while your sitting in the car its very noticeable also. and also in the mornings when the motor is not fully warm the car will buck once or twice while going down the road.