95 Bonneville random stuttering and bucking - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 01-11-2009, 04:18 PM   #1
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Angry 95 Bonneville random stuttering and bucking

Hi,

I'm at my wits end trying to figure out this problem. My car'* got almost 200,000 miles and was running good with no major problems. Then the car starting stuttering at random and is getting worse. Sometimes it runs just fine for awhile and then starts up again, the check engine light might come on for a few minutes and then go out. So far I've replaced the fuel filter, fuel pump, and fuel relay. Also replace the Mass Airflow Sensor, new plugs, wires and checked the coils. Any ideas would be greatly appreciated.

thanks,

Keith D.
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Old 01-11-2009, 04:50 PM   #2
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How about your O2 sensor? How did the plugs look when you pulled them?
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Old 01-11-2009, 05:42 PM   #3
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Check to make sure your spark plug wires are not touching the o2 sensor wires. If they touch it might make your car act like your describing.
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Old 01-26-2009, 06:37 PM   #4
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did you check the cat? I seafoamed mine and it bucked a lot and then took it on a long ride and heated it up.It went ok after that.
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Old 01-26-2009, 10:16 PM   #5
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i would check the coils again
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Old 01-27-2009, 12:01 PM   #6
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AND check for the dreaded vacuum leak................I had one at the tranny vacuum modulator that kinda had those symptoms..........
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Old 01-27-2009, 12:18 PM   #7
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Also check the PCV valve.
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Old 01-27-2009, 02:55 PM   #8
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Does it do this going up or down a hill, when engine is warmed up or while it is still cold, right after you let off the gas?
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Old 01-31-2009, 09:33 AM   #9
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I'm having a very similar problem with my 95 SE with 175k. It stutters and bucks at light acceleration (when traveling on highway). No engine light though. I replaced plugs and checked all fluids. Old plugs looked great. Is there a way to test the PCV? Also, can I put a vacuum pump on the modulator to test that? Thanks, Tom
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Old 01-31-2009, 09:45 AM   #10
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Here'* how to change and check the PCV valve. It'* on a supercharged engine but checking yours is the same.

https://www.gmforum.com/t279060/

You will also want to test your coils and plug wires if your engine is stuttering. There'* a procedure for that in the tech info area as well.
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