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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 11-05-2003, 09:43 AM   #1
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Generally the Bonnie runs great and accelerates very smoothly. However, for no reason it sometimes starts misfiring while I am driving at a steady spead or accelerating up a hill. Then the problem will clear and it is ok again for a while

Any thoughts on what I should check?
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Old 11-05-2003, 11:05 AM   #2
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downshift once does it get better?
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Old 11-05-2003, 11:22 AM   #3
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Do you think it may be the spark plugs?
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Old 11-05-2003, 11:33 AM   #4
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mine still misfires too new ac delco plugs and wiresnt arent a year old yet. someday ill find my misfire but it only does it going up hills
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Old 11-05-2003, 12:59 PM   #5
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The most likely cause is a bad plug/wire/coil. You need to put your year and model in your sig, and tell us if you're still running the stock wires, and how many miles on them.
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Old 11-05-2003, 04:27 PM   #6
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It is a 1995 Bonneville SLE with 107,000 miles. I am the original owner and the plugs were changed at 60,000. The wires, coils etc are orginal

Thanks
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Old 11-05-2003, 04:30 PM   #7
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You're due for plugs and wires. Do those before wasting any money on anything else. I'd also suggest a fuel filter, air filter, and pcv valve at the same time. There'* a coil pack troubleshooting procedure in Techinfo.

But do the plugs and wires. They're due/overdue.
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