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Old 01-22-2013, 10:38   #1 (permalink)
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Bad Shudder/Stumble

Hopefully someone can point me in the right direction...

Today on my way home from work, my GM developed a bad shudder/stumble on light acceleration, steady speed, and sometimes while sitting in gear at idle. If I put my foot into it, it clears up and seems to run fine. It also goes away if I put it in park or neutral. The "foghorn" sound from the airbox has also returned, and it almost seems as if it may be related to my shudder issue. I say this because the only time I noticed the shudder while sitting idle, was when the "foghorn" sound was happening. The spark plugs in the car only have around 5k miles on them, all 8 coils only have maybe 100 miles on them, the IAC was cleaned 2 weeks ago, and I'm not getting any CEL or codes. If anyone can point me in the right direction on where to start looking for a problem, I'd greatly appreciate it.
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Old 01-22-2013, 10:52   #2 (permalink)
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Re: Bad Shudder/Stumble

Could have a quick check on all vac hose / pipes for any leaks .
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Old 01-22-2013, 11:40   #3 (permalink)
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Re: Bad Shudder/Stumble

Could a bad IAC gasket cause this? A buddy of mine had it apart 2 weeks ago and he had mentioned that the gasket has seen better days.
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Old 01-22-2013, 12:04   #4 (permalink)
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Re: Bad Shudder/Stumble

If it's drawing air , it wont help .You could make a new gasket from gasket paper if not able to get to parts / supplier store and eliminate that possible cause .
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Old 01-22-2013, 13:47   #5 (permalink)
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Re: Bad Shudder/Stumble

Took it for a short drive and the CEL came on...Had autozone scan it, and he told me I have a misfire on cyl. 4, and both downstream o2 sensors are throwing codes. The temp. here is 7 degrees with a windchill of -14. Could this have anything to do with it or should I swap out the #4 coil and/or plug? The parts store guy said the fuel line to that injector could be froze up...but I've come to learn not to believe everything you hear at the parts store.
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Old 01-22-2013, 17:13   #6 (permalink)
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Re: Bad Shudder/Stumble

I'd switch the coil with another position and look at the plug. It may be water in thehole around the plug too. Don't worry about the O2 codes yet.
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Old 01-22-2013, 17:29   #7 (permalink)
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Re: Bad Shudder/Stumble

Ok, I will try that tomorrow. Thanks
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Old 01-23-2013, 16:27   #8 (permalink)
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Re: Bad Shudder/Stumble

Removed the #4 coil and plug...the threaded area of the plug was rusted/gunked up, but the rest of it looked normal, so I cleaned it off, re-gapped it, and swapped out the coil for one of the old ones I still had. VOILA!! No more stumble! Now if I could only find a solution to the foghorn sound from the airbox, I'd be in good shape lol. Thanks for the help guys!
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Old 01-23-2013, 20:45   #9 (permalink)
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Re: Bad Shudder/Stumble

Maybe it's not sealing very good. Thanks for the update on the misfire.
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Old 01-24-2013, 17:46   #10 (permalink)
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Re: Bad Shudder/Stumble

BTW OO, you have a fuel rail that feeds each bank of injectors, not individual lines. Unlikely that they would ever freeze up. -14 degrees! Yikes!
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