Question about GMC Safari
Was the vehicle stumbling and shifting hard, before the major tune up, if not, i would check all of the connections on top of your engine, just to make sure nothing was accidently unplugged , when doing the tune up, if everything checks out ok, i would check the throttle positioning sensor, this is connected into the side of the throttle body, and it has a wire connection to it, hope that this information has helped you. this can create stumbling. also was the new spark plugs that were installed properly gapped.
Posted on Apr 11, 2011
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Posted on Jan 02, 2017
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