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Backfire - coil problem?

(1990 Chevrolet 1500 Pickup)
in Boulder, WY on May 17, 2010
5.7L engine. After starting it either runs fine or idles very low, backfires/hesitates when revved at idle, can accelerate very, very slowly otherwise will backfire and lose power. Local mech said might be coil. No check engine or any other warning light is lit. Suggestions?
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Popular Answer
on May 20, 2010
Test the ignition coil using an st-125 spark tester.
on December 15, 2010
check ignition module located in distrbutor your local auto parts store will do this for free
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