SURGING PROBLEM

1991 GMC S15

Tiny

POTSY

March, 17, 2008 AT 2:17 PM

Engine Mechanical problem
1991 GMC S15 V8 Two Wheel Drive Automatic 15000 miles

We replaced the 4.3l with a 5.7l and now we are having a surging problem when I let go of the gas pedal, coming to a stop, it will surge from 2000rpm- 1000rpm. I've had it to a couple of mechanics and they are baffled as well.

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