P0300 Misfires past 4000 RPM - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat

2000-2005 Discuss your 2000-2005 Bonneville SE, SLE, and SSEi Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 10-27-2006, 10:00 PM   #21
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This thing runs like a rocket ship now! The instant MPG is still reading real low though (reset the PCM too) so I am assuming there is something causing me to run rich and burn up my Cat? The recalled Fuel pressure regulator was replaced already.
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