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P0300//mulitiple misfire
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08-24-2008, 11:47 PM
Ryan Graham
Hummer Veteran
Join Date: Mar 2008
Location: Syracuse, UT
Posts: 60
Re: P0300//mulitiple misfire
Head/valve problem? You'll have to do a compression and leak down test to verify. I had a P0300 and the dealership did an injector cleaning. The code hasn't come back, but the intermittently rough idle is still there.
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