2003 Chevy Impala lack of power

Tiny
RCAREY4128
  • MEMBER
  • 2003 CHEVROLET IMPALA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 122,000 MILES
Problems started a few weeks ago. When accelerating car bogs down and slowly picks up speed.
From a stop it is good up to about 30 then the problem kicks in.
On the hi-way driving along is ok until the road goes up hill a little, speed slows down rpms jump up and down and car bucks.
If accelerating at this point it does nothing and sometimes will drop into neutral and tach out.
Also get random misfires every once in a while.
So far since the car has high miles I have replaced fuel filter, plugs, wires, coil packs, ignition control module and mass airflow sensor.
Also fuel pressure regulator had slow vacuum leak and was replaced.

What else is left to replace to try fixing this?
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Thursday, February 18th, 2010 AT 3:30 PM

3 Replies

Tiny
DOCFIXIT
  • EXPERT
Seems the transmission is the issue and is slipping
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Thursday, February 18th, 2010 AT 3:47 PM
Tiny
RCAREY4128
  • MEMBER
Transmision people say not transmision problem. Car runs almost perfect with new mass airflow sensor unplugged. Exact same problem with old and new sensor. Only slugish at highway full throttle with unplugged.
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Friday, February 19th, 2010 AT 9:08 AM
Tiny
DOCFIXIT
  • EXPERT
When engine runs better with MAF unpluged then cam sensor is usually at fault. 3.4L or 3.8 L
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Friday, February 19th, 2010 AT 12:09 PM

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