I have a 94 gmc seirra z71 5.7 liter 350

Asked by Jason Dec 09, 2013 at 08:21 PM about the 1994 GMC Sierra C/K 1500

Question type: Maintenance & Repair

Truck starts up idles great, drives
great untill trunk warms up, still idles
good, will drive fine untill  you push
pedal down to floor, it starts missing
and backfires

3 Answers
40,125

James answered 10 years ago

the old high tension wires are letting the spark find an easier way to ground, look fro grey powder around heavy wires at loss spot

Mark helpful

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