2003 Chevy Malibu Acceleration w/pushing gas pedal

Tiny
CHIROPTERA980
  • MEMBER
  • 2003 CHEVROLET MALIBU
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 150,000 MILES
Intermittent problem. Happens when engine is hot and have been driving off and on all day or for a long time. Idles high at 1500 rpm in drive, neutral idles at 2000 rpm, idles in park at 3000 rpm. Braking is very difficult because it feels as if Im pushing the accelerator while braking. When I let off the brake the car accelerates on its own without pushing gas pedal. Its goes all the way up to 50mph or higher without pushing gas at all. Driving on interstate today I didn't use gas pedal, it went up to 70mph and then dropped down to 55mph then went back up to 65 then down to 50 then up to 65 then down below 50. It does this very slowly and sometimes holds a speed as if in cruise control but cruise control is off.
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Wednesday, April 7th, 2010 AT 5:15 PM

4 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Clean out the idle air control valve and test the throttle positon sensor also clean out the throttle plate and inspect the throttle cable if its kinked
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Thursday, April 8th, 2010 AT 3:22 AM
Tiny
CHIROPTERA980
  • MEMBER
  • 2 POSTS
IAC has been tested. Throttle plate is clean, cable is not too loose, too tight, or kinked. TPS has also been checked. No problems found in any of these components. I disconnected the cruise control today and I will see if the problem stops. Any other components you'd recommend testing? I've never heard of this problem before so I'm a bit stumped. Thanks for your help.
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Thursday, April 8th, 2010 AT 4:19 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check and test the MAP sensor and the fuel pressure
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Friday, April 9th, 2010 AT 1:43 PM
Tiny
NIKKIEB1979
  • MEMBER
  • 1 POST
Did unplugging cruise control help. I just unplugged mine having same issues and no answers. This is the last step before have to look for new car.
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Thursday, March 19th, 2015 AT 9:28 AM

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