2002 pontiac grand am, 2.2L eco-tech p0300

2002 PONTIAC GRAND AM
4 CYL • 2WD • AUTOMATIC
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JEDICLON40
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I recently had my check engine light start to blink. tested the code and it was p0300.

I changed the plugs, coil,icm,checked vaccum,fuel pressure even battery and alt.

after i changed the icm the car ran beautiful until i was in the drive-thru, the light started to blink again. as it is supposed to do, the engine went into rich mode ie.trac off no power running rich. i am at my wits end! any help in what direction i should go would be greatly appreciated. also when it went into rich mode.it died and acted like the batt. was dead until i jumped it.
May 7, 2011 at 4:39 PM
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FIXITMR
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read codes again?
May 7, 2011 at 5:41 PM
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JEDICLON40
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yes, same code p0300.

also just sis the dollar bill test on the tailpipe, tried to suck it in. vacuum test held steady 40.
May 7, 2011 at 6:59 PM
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FIXITMR
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when it's cold again how does it run? sitting in drive thru heats engine up. when it does it again, try unplugging MAF or ECT.
May 12, 2011 at 5:15 AM