1998 Pontiac Firebird Rough idle,lack of power

1998 PONTIAC FIREBIRD
18,500 MILES • 6 CYL • 2WD • AUTOMATIC
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CLAYTON NUNBERG
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Car has new heads,plugs,wires,fuel injectors, and mechanics code reader says cylinder miss. Bad cat? Rough idle and lack of power,,thanx..
Aug 3, 2010 at 11:35 PM
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RASMATAZ
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Could be the CAT if it has an excessive backpressure in the exhaust-also the idle air control valve, EGR valve, throttle position and manifold absolute pressure sensors. Also check fuel pressure
Aug 4, 2010 at 1:07 AM