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1999 GMC Suburban 1500 Question: what causes loss of power with high rpms and downshifting during passing attempt

 

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coloradogmc, 5.7L V8, Kremmling, CO, December 28, 2012, 11:35
 Rookie

when stepping on the gas to pass at 65 mph, the tranny downshifts, the rpms run to 4500-5000, yet there is complete loss of power and acceleration. Also happens when climbing steep inclines. Cat. convertor just replaced.

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