1998 GMC Sierra poor acceleration and idling

Tiny
TOYTACO
  • MEMBER
  • 1998 GMC SIERRA
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 200,178 MILES
Truck is hard to start. Chugs really bad when idling, almost like a lope. Has a hard time accelerating from a stop, and sometimes will stall or bog really bad. Uses alot of gas for a v6. Smokes sometimes when started and reeks of a gas smell. I have a p300 multiple cylinder misfire code. Ive replaced the cap, rotor, plugs, wires, coil, and fuel filter.
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Wednesday, December 30th, 2009 AT 7:43 PM

1 Reply

Tiny
MATHIASO
  • MEMBER
Hello_

The random misfire DTC indicates multiple cylinders are
misfiring or the PCM cannot identify which cylinder is misfiring.
The underlying cause is often a lean fuel condition, which may be due to a vacuum leak
in the intake manifold or unmetered air getting past the airflow sensor.
Check also for a malfunctioning Camshaft position sensor (CMP) or stuck open EGR valve.
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Thursday, December 31st, 2009 AT 1:47 AM

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