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Fluxuating RPM while driving usually about 500 RPM or so

Tiny
TOMJACK
  • MEMBER
  • 2002 DODGE TRUCK
  • 120,000 MILES
Fluctuating rpm while driving usually about 500 rpm or so for no reason. Rpm drops to zero rpm while stopped and will stall out, can maintain idle rpm with foot on accelerator while braking at a stop.I replaced the idle air control valve not to long ago, at that time it would just die applying the accelerator did not stop it from dying seemed to be the fix.
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Sunday, September 4th, 2011 AT 2:27 PM

3 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
How long since a tune-up? Any applicable trouble codes? My first thought was the vehicle speed sensor, can't be sure at the moment?
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Sunday, September 4th, 2011 AT 9:15 PM
Tiny
TOMJACK
  • MEMBER
  • 3 POSTS
Tuneup not to long ago it was like 100000 before the first tuneup, the engine light just lit up about 100 miles ago, towed a u haul up to NC from fl as soon as the weight was applied everything went down hill even tranny downshifting very hard
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Monday, September 5th, 2011 AT 12:42 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check engine light on
https://www.2carpros.com/articles/service-engine-soon-or-check-engine-light-on-or-flashing

Have the computer scanned for code/s-you have a problem within the engine management system that caused the CEL to turn on-This is your starting point of diagnosis,finding out what's going on.
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Monday, September 5th, 2011 AT 1:05 AM

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