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2003 Suburban 5.3l Flex Fuel P0101 P0171 P0174

Hammertime540

By Hammertime540
in Ask A GM Technician

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Hammertime540

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2003 Suburban k1500 5.3l flex fuel, 101,266 miles

 

Motor runs rough at idle when motor temps are cold. When the outside temps are near 0 the motor runs rough at idle no matter the engine temp. Sprayed intake cleaner between the intake and heads when the motor was at normal operating temp the idle didn't change outside temps were in high teens.

 

Today I had a buddies ODBII reader, was reading the fuel trim both sides idling at 15, when I sprayed intake cleaner today i found a little stumble on the left side of engine at about middle of the intake and head. The fuel trim would drop to as low as -6. Both sides would drop into negative numbers but only the left side cause a stumble. The outside temps were 28 at the time. The idle is fine too. So I was wondering should I replace the intake gasket? Anything else?

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