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1996 GMC Jimmy Engine Missing during accel.

Tiny
TRENTW67
  • MEMBER
  • 1996 GMC JIMMY
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 260,000 MILES
Heres a good one. Just bought a stock '96 jimmy 4x4. Starts fine, idles/revs beautifully, but on acceleration it misses. BAD. What could this possibly be? O2 sensor? Injector? HELP! Thank you!
Monday, May 11th, 2009 AT 9:29 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Dirty fuel injectors (cleaning the injectors often fixes this).
Bad MAP (manifold absolute pressure) sensor
Bad TPS (throttle position) sensor
Bad or dirty MAF (mass airflow) sensor
Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
Bad gasoline (fuel contaminated with water or too much alcohol)

Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include:

Dirty or worn spark plugs
Bad plug wires
Weak ignition coil
Wet plug wires
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Monday, May 11th, 2009 AT 9:32 PM

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