Ok so my car runs bad at idle and has a slight misfire at mid rpms. Ive checked EVERYTHING i could possible think of: Timing, injectors, fuel pressure, evap system, pvc, spark plugs, dist cap......is there ANYTHING else im missing?

 

ECM (computer) ?

 

Are you getting any codes?

 

no, no codes

do computers just go bad out of the blue? Or by jump starting it? This all seemed to maybe have started when i jumped it.

 

ANYBODY???

 

Uh.. my pet pive the EGR...

 

What????

 

iac?

 

A LEAK FROM YOUR POWER BOOSTER COULD CAUSE IT CHECK THE HOSE AND WERE IT PLUGS INTO THE BOOSTER.

 

the EGR could be sticking and not closing when it should be. The excess vacuum it creates by staying open wreaks havoc on the timing.

A simple test is to get the engine dead cold and remove the plug. Drive around, and if the problem goes away, you got the culprit.

 

However, that would only be when appling breaks. And when if that diaphram goes out the engine bay is flooded with the hiss of the leak.

 

what about a MAF? didn't see it in your list. mine had a miss in mid RPM's as a result of a bad MAF, it actually has a minor and occasional miss right now in mid RPM , and is a little sluggish off the line (closed loop operation) and i'm thinking it's related to the bad O2 sensor it has right now...another possibility.

 

3.1'are MAPS's not MAF.

 

Fast, i'm in my on lala world....didn't even notice the year or engine. happens to the best of us, i hope.

 

The EGR staying open creates excess vacuum and leans out the AFR.