Question about 1996 GMC Suburban

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My 1996 GMC Suburban has 170600 miles on it. In the last week, it drives fine until you travel about 1/4 mile & reach 30 mph. Then, you loose acceleration. When you push the gas, the engine just revs. When you turn a corner, no problem again until you have gone 1/4 mile. It is fine in 1st & 2nd. When you reach 50+ mph, no more problems. We have changed the fuel filter & throttle position sensor to no benefit. Transmission fluid is full, slightly dirty, but fine. Any suggestions?

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Try dropping the tranny fluid and changing the tranny filter and filling with fresh fluid. Sounds like the tranny is sleeping between shifts.

Posted on Apr 10, 2011

  • Joe Boydstun Jun 26, 2013

    I have the same problem and changed that and the throttle position sensor and still does this.

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