Bad stumble - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 10-28-2004, 08:15 PM   #1
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Default Bad stumble

Part throttle cruise is fine, decent idle, wires are only a year old (which may not mean much I know), but when you mash the throttle it falls flat on its face. Sometimes you can feel the timing being pulled too / borderline detonation maybe. Trying to decide if I should start with the Cat-canvertor, or the fuel system. Suggestions?
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Old 10-28-2004, 08:24 PM   #2
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defintally check the cat converter..give it a few kicks if it rattles bad have it replaced at a good exhaust shop..have a high performance one put on there..my old 93 SSEi did the same thing almost like a dead miss at WOT..the HP cat converter is a nice set up..much smaller than the huge factory one.
You might consider scanning it for codes...if u have a bad CAT it could also cause premature death of your O2 sensor.
Other ideas:
Throttle Position Sensor
Most Likely: Cat Converter
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