Question about 1989 GMC Sierra

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Rough accleration through 2nd gear

Truck is 4 speed automatic. Truck acclerates rough through first and into second before smoothing out. Have replaced plugs, rotor, cap, fuel filter, pcv, exhaust system and transmission. What else can it be?

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Had a loose Distributor cap and spark plug. Changed out the plug wires anyway and truck runs great.

Posted on Jun 25, 2009

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