i have a 1994 z71 350 5.7 when i turn it over it wont start but when i turn it over and give it some gas it will back fire and blow black smoke out the tailpipe

Asked by Mar 09, 2015 at 10:50 PM about the 1994 GMC Sierra

Question type: Maintenance & Repair

1 Answer

615

sounds like it jumped time.

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