Idle high then low then normal got a P0300 code

PONT9701

MEMBER
2002 CHEVROLET MALIBU
451,166 MILES

I have a 2002 Chevy Malibu LS 3.1 with about 451,166 miles. This is whats happening so far the car has been acting crazy it idle high then low then normal then go crazy again at a stop the car has shut off for no apparent reason it starts right up after I put it in nuetral. The last time it did that it was the ignition module getting hot and shutting off the car I have replaced the fuel pump (was going bad). Mass air flow sensor I thought this would fix the idle it did for a few days, new plugs and wires ac delco (got a po300 code) there was a bad injector #3 (got a code for this too) I replaced it. After all that the car still runs rough I realize its not a new car nor will it run like new but i'm really trying to keep it alive. Any suggestions on what else it could be?

2 Replies

FIXITMR

MECHANIC
9,990 POSTS

Clean check the IAC and EGR valves and throttle butterfly.

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Sunday, February 26th, 2012 AT 5:55 AM

PONT9701

MEMBER
2 POSTS

I cleaned the IAC how would I clean the EGR Valve? I cleaned the throttle butterfly and a lot of dirt came off. But thinking the IAC is bad I did clean it ran fine but it still ran a bit rough.