[Diy_efi] P0300 Random/Multiple Cylinder Missfire Detected

[Matthew McCain]

Hello,
        I have a 2001 Chevy Blazer that has 30K miles on it.  I can feel it
missing slightly when going up hills. Only when the TCC is engaged, I know
you will feel more of a miss then.  When I go up steep hills on the
interstate the MIL will start to flash indicating a missfire is going on.
Then sometimes it will stay on constantly.  It is under warenty with GM,
They can not find a problem with it other than a P0300 code.  They gave the
ECM a firmware update, and it seemed to help for a while.  I have read on
the net that for some reason the wires on a blazer need to be changed every
30K miles to eliminate the problem.  I have inspected the wires and they
look good.  I know sometimes you can't tell by looking at them.  It idles
ok, and accelerates ok.  Any suggestions?  Thoughts?

Thanks,
Matt




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