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99 Grand Am

Tiny
JAMES30
  • MEMBER
  • 1999 PONTIAC 1000
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 165,000 MILES
Was drivin my 99 grand an 2.4 and was going 40 mph and then all the sudden started******** sputtering chuging and won't go over 40 mph now. Just replaced plugs and boots didn't help still doing it
Friday, June 17th, 2011 AT 4:42 PM

2 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Check fuel pressure
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Friday, June 17th, 2011 AT 4:49 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Possibilities here could be caused by one of the following below

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Crankshaft position sensor
Knock sensor
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note:If it doesn't apply disregard it and keep testing.
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Friday, June 17th, 2011 AT 4:49 PM

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