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Q: Speedometer Jumpy.Check engine light on.tranny slips/misses at heavy acceleration on 2000 GMC Savana 1500

Speedometer Jumpy...Check engine light on...tranny slips and misses at heavy acceleration...
Could these symptoms occur from a bad/faulty/dirty speed sensor on transmission
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I have the same problem, idles fine, bucking, lurching on acceleration or under any load. Did you find out anything?

I have the same problem, starts - idles fine. Low speed under 20mph everything is fine (except speedo jumping all over the place). Try to accelerate and get this lurching, bucking backfire and can maybe make it to 45 mph. Runs fine for a few seconds and then repeats the same thing all over again. No check engine light at all during this process.
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