VEHICLE SUGES WHILE DRIVING

GMC Jimmy

Tiny

kreskin

April, 18, 2007 AT 4:22 PM

I have a 1996 GMC Jimmy 4x4 with a 4.3L engine about a week ago it started surging well driving at highway speeds I've changed the cap and rotor, spark plugs, Ignition wires and Fuel filter with no luck.I've taken it to a mechanic did the diagnostic checks checking egrvalve, throttle positioning sensor, maf sensor all seem to be working fine also took it to a transmission shop the only thing they could come up with is a bad 'o' ring from the torque converter not allowing the proper pressure is this possible?

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