Question about 2000 GMC New Sierra 1500

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Gm new sierra 1500 4x4 chugging when light acceleration

Usually when rpm at 1000 to 1500 and in high gear and may be going up a slight grade just before the tranny shifts down

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Egr valve

Posted on Dec 09, 2008

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Could be a variety of systems, however I would suggest the following first:
Don't waste money on High Octane fuel or injector cleaners. These have very little to no impact on performance anyway.

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You can often test this while at idle with AC off. Then turn AC on to determine if the RPM or idle changes. If no, then suspect the IAC valve.
It can be bad or just be very dirty (ports blocked).
Remove, clean and replace to see if that helps. If you see a lot of carbon buildup, then get that all cleaned up.
If this does not help, then replace with a new one and go from there.

Let us know, then we will try something else.

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Your clutch is goin g out on it.

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