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#1
08-06-2003, 11:24 PM
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99denali runs bad 1/2 throttle help please
99 gmc yukon denali has no power above 1/2 throttle under accel
bogs down everytime.. 99000 miles no check engine light new cap, rotor, plugs, wires new mass air flow two new converters all ecm values look good fuel pressure good was doing this before all these new parts, the problem is everything works under 1/2 throttle perfectly.. anyone respond 
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#2
08-07-2003, 07:42 AM
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What is the fuel pressure when this occurs?
Also, have you checked exhaust back pressure?
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