My 1997 gmc safari runs rough and chugs when first started, once it warms up it runs fine. What is the problem?

Asked by doctordee Jan 13, 2016 at 05:19 PM about the 1997 GMC Safari 3 Dr SLX AWD Passenger Van Extended

Question type: Maintenance & Repair

My 1997 gmc safari when cold, runs very choppy and rough. Once it warms up, after a few miles, it runs great. What could be the problem?

2 Answers

154,205

Possible temperature sending unit. This along with the 02 sensors send information to the ECM to properly adjust all the other sensors. You may want to have it scanned for codes.

replace the cap and rotor. New plugs & wires. The dist. cap if old will cause the engine to missfire during cranking & van will take forever to start. It will run very bad until it warms up, MAYBE. Replace car & rotor & it will run 100% better and start easier.

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