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1994 GMC 1500 backfiring

Tiny
JACKCAN73
  • MEMBER
  • 1994 GMC C1500
I recently changed exhaust manifold, spark plugs and plugwires. Now my truck backfires when reved up, and driving very slugish and studders alot? 1994 gmc sierra 4x4 automatic 119,000 mi v8 5.0l
Monday, November 12th, 2007 AT 4:37 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check the routing of the spark plugwires could be crossing over to an other wire. Sparkplugs with wrong heat range, ignition timing off, too rich or lean fuel mixture, hot valves and carbons in the chamber.
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Tuesday, November 13th, 2007 AT 2:50 PM

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