Temporary low RPM on stop.

[Vitaliy]

I have problem with idle every time I stop.
Everything is fine while driving but when fully stopped on traffic light the RPMs goes to ~500, keeps it for about 5sec. then slowly goes to 760 RPM.
It happens ONLY when stop after driving and right after engine start.
It does not happen on cold engine
Sometimes I got P0131 and P0455 error codes.
Also when I'm on highway >100km/h feels like engine has no power. In few secons everythins goes back to normal.
Any ideas where I can start?

 

[HCFL]

Same thing used to happen on my old 02' protg es. I had no idea what it was but it was ******* annoying. It felt like something to do with the ignition. Almost like ignition cut out for that amount of time. I don't believe it was fuel because when it came back it came back strong.

I have an 03' MSP and it does not do that. Although I have sort of a similar symptom. When I drive over 4,000 rpm and need to stop pretty quickly, the car sometimes stalls when the rpm come down after I push in the clutch. I've combat the problem by downshifting everywhere.

I'd start with ignition. For me it was hard to diagnose though, because it didn't happen all that often.

Good luck dude. I'll keep this thread handy as it'll be great to know what the problem is.

 

[CoTa]

Check for vacuum leaks. The line going from the brake booster to the back of the intake manfold seems to be common for splitting. Some times a faulty/dirty egr will cause this problem. Check gas cap gasket. You can try flipping it over to get a better seal(this is not likely causing you problem tho)