Ignition Blunders - 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 05-11-2005, 01:57 AM   #1
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Default Ignition Blunders

1993 Pontiac Bonneville SE 3800 N/sc

If my car sits for a while it starts up and operates great for about 5 min. Then, it will chug under load and have irratic rpm. It almost feels like its trying to grab a gear but it isnt just feels like that. When I slam on the gas from a dead stop I get *chug chug chug chug vrooom chug chug*. My coil packs tested good, brand new tps, fairly new plugs and wires,new o2sensor. Whats the deal? Need Ideas Im out of em.
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Old 05-11-2005, 09:31 AM   #2
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[shoots from hip] Have you checked the fuel pump and fuel filter? [/shoots from hip]

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Old 05-11-2005, 09:39 AM   #3
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Have you checked with a DIFFERENT ICM/Coils? Just because it tested, doesn't mean it'* good. That test is usually inaccurate unfortunately.


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Old 05-11-2005, 11:18 AM   #4
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I'm voting fuel flow too (gut feeling) based on the "If it sits for a while..." statement
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Old 05-11-2005, 11:29 AM   #5
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Vacuum leak.
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Old 05-11-2005, 03:47 PM   #6
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Well Its a new fuel pump.... but i havent changed the filter for a long while....
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Old 05-11-2005, 11:28 PM   #7
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Vacuum Leak.
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Old 05-11-2005, 11:45 PM   #8
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I'm gonna 3rd the vacuum leak.
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Old 05-12-2005, 04:05 AM   #9
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Any key areas to check? known areas of problems?
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Old 05-12-2005, 08:53 AM   #10
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You mention filter in a long time. Wouldn't be a bad thing to do while you are working on the car.
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