Mechanics

ENGINE

1999 GMC Jimmy

Engine problem
1999 GMC Jimmy 6 cyl Four Wheel Drive Automatic 157000 miles

I have a vortec 4.3L and when I accelerate the RPM go up but the speed wont increase very fast. Also when I get going the engine will struggle and pulsate. I checked the fuel filter and air intake. The Mass flow air is new. Can you help me please?
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Ryanfortin
January 10, 2008.




To me that sounds like something in the drivetrain possibly trans. Or rear end or could be torque converter I would have that looked at.

Tiny
Truckchevy4
Jan 10, 2008.


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