I have no power,going up hills.1993 gmc sierra pick up 4.3 v6 at/ac/ps K1500 4x4 . I have tuned up , changed the cata;itic convertor,changed alternator,belts and tensioner,rebuilt the tranny@ 218k ,new battery,oil is changed every 4000 mi.
223,000 miles approx. 4k mi per week. the truck runs excellent on flat (level)ground but put a hill in front of it and the truck will drop from 70 at the bottom to 40 at the top. i am at a loss trying to find out what to fix next, please help
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