2000 Isuzu Rodeo Question missfire

2000 ISUZU RODEO
111,982 MILES • 6 CYL • 4WD • AUTOMATIC
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BILLS5413
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I have 3 codes from my obd2 reader
#1 p0300
#2 p1133
#3 p0131
I have replaced the spark plugs, all the coils, the mass air flow, the egr valve air filter, both converters and muffler
its reading mutipul missfire detected, controlled fuel mettering and 02 sensor low volts bank 1 sensor 1

missfire at low rpm and at stop and sometimes while driving, what can I do next? It's driving me crazy
Thanks,Mr Confused
May 6, 2010 at 11:38 AM
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2CARPRO JACK
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Since both o2 sensors are switching properly and it has a miss, I would lean towards a vacuum leak somewhere, as long as the engine has good compression.Try carefully spraying around theintake area with carb cleaner with engine idling.If you spray aleak, the idle quality will change.Check where the upper and lower intake mate as well as all vacuum lines.Could be a bad injector, but be sure no vacuum leaks first
May 8, 2010 at 8:50 AM
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BILLS5413
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Guy's I found that the mass airflow sensor was bad, and the I got a reading that 1 o2 senors was bad, there was no vacuum leak, I think you should do more research before you give advise on driveablity problems, thanks anyway.

Thanks...Bill
May 12, 2010 at 8:02 AM
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2CARPRO JACK
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Vacuum leaks are more common than MAF sensors and dont cost anything to repair, but thanks for the advice
May 12, 2010 at 8:06 AM