Question about 2000 Chevrolet Silverado

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2000 Chevy Silverado

Surges between 45 and 55 mph. In other words, I loose hp when the engine idles down at these speeds to about 1200rpm. I have acceleration, but idling at these speed, there is an obvious stutter, surge, rmmm, uhuhhhhuhhh, rrrrmmm feel. To overcome, I drive in tow haul, which I believe down shifts the transmission applying more torgue and drives at higher rpms to overcome. After a code scan revealed I must change out my catylytic converters, I hoped that was this issue. I have them replaced and still the same surging. No more codes. I also had my transmission rebuilt a year and one half ago. I can't recall if this occurred before that, or not.

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  • billdozier May 19, 2009

    Pulsing, or hopping sounds more accurate. Once I hit around 45, normal driving, I get a quick Up and Down. The tach moves up and down a little as well. It is very much like I am tap dancing on the accelerator. This goes away once I hit around 55, or accelerate hard. Or, I can drive in tow haul mode which puts me at higher rpm's, but kills my mpg.
    Would I get uneven acceleration only between those speeds (or it may be a particular gear) with a TPS set-up?


  • pastrust55 May 11, 2010

    If it was the transmission, you would hear the engine rev out, not idle down. It may be your throttle position sensor set up. You have to get someone to check voltages at the sensors to see if they are working correctly. (You may also be experiencing an uneven acceleration ...pulsing or hopping?)

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I would get a techie to check the throttle position sensors... this has been a problem on the Chev/GMC set up.

Posted on May 19, 2009

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