2002 Gmc Sonoma Runs Find Untill Put Aload On Engine Ie Hill 70 Mph Seems Lose

80,000 MILES
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Runs find untill I put aload on the engine ie up a hill at 70 mph seems to lose all power. once off the hill everything is fine. Most of my driving is done under 50 mph in the city never a problem except for low mileage between 15 -17.
Jan 15, 2013 at 1:03 PM
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DOCFIXIT
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Last tune? check fuel pressure? check engine light on?
Jan 15, 2013 at 1:20 PM
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