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NEED HELP random misfire

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Old 03-12-2014, 10:11 AM
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Default NEED HELP random misfire
Random misfire detected... What do I start troubleshooting? Already has new plugs and wires.... Kooks longtube headers, no cats.
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Old 03-12-2014, 10:20 AM
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Originally Posted by hooker2007
Random misfire detected... What do I start troubleshooting? Already has new plugs and wires.... Kooks longtube headers, no cats.
From my experience it's normally a vacuum leak. That's where I would start. But there are tons of other things that can give the P0300 code or did it give a specific cylinder misfire?

Was the check engine light just on or was it flashing?
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Old 03-12-2014, 03:00 PM
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Past 2002 GM made it to where the code was no longer specific :/.
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Old 03-12-2014, 03:01 PM
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Originally Posted by MFJ
From my experience it's normally a vacuum leak. That's where I would start. But there are tons of other things that can give the P0300 code or did it give a specific cylinder misfire?

Was the check engine light just on or was it flashing?
Check engine stayed on.
EGR may be deleted?
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Old 03-12-2014, 03:09 PM
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Maybe try the tune diagnostic forum???
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Old 03-12-2014, 03:10 PM
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P1133 Bank 1 Fuel Control Shifted Lean

And

P0300 Random Misfire Detected
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Old 03-12-2014, 04:36 PM
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https://ls1tech.com/forums/pcm-diagn...3-p1153-2.html
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