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Posted on Sep 11, 2011
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Idles up and down and hesitates under a load - 1990 GMC Sierra

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vicky udofia

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  • Posted on Sep 11, 2011
vicky udofia
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Without a steady idle rate, its bound to act up when there s load on it cos with the fluctuation the idle might be too low at some point. Things to look at will be the idle control solenoid, throttle body, MAF sensor, check if carbon tracked then clean out throttle body with carbeurator cleaner.

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