rough idle on 2002 Cadillac DeVille

4.6 noth star i change the plugs and wires crank sensors fuel filter code PO300 mutiple mis fire what else could this be

by in Ridgewood, NY on January 09, 2010
2 answers
ANSWER by on January 09, 2010
Here is a ton of great information about the P0300 code:
ANSWER by on June 16, 2010
Try the Vacuum Hose's or Brake Booster.
Related Items:
and apply the brakes. I experience rough idle until i start driving again.
rough idle at start up. runs okay on road
The EGR valve may stick open, causing a rough idle and/or the Check Engine Light to illuminate.
Fuel injectors can short-circuit electrically causing a rougher than normal idle and reduced performance.  

Related Content