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1978 gmc sierra runs rough

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Old 06-16-2015, 06:12 PM
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Default 1978 gmc sierra runs rough

Hey first thread ever new at this just got a new dumpster on wheels 1978 gmc sierra that runs in neutral or in park and can rev it up with fairly clean acceleration and is able to go to high RPMs .But when in drive engine skips and hiccups but slowly increases speed ..Transmission shifts normal but tends to pop into 2nd gear a little i think only because of trying to accelerate heavy..Also if the vehicle is in reverse the transmission seems normal and vehicle just runs rough.. Help,Please and Thanks Brandon
 
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