2002 Cadillac DeVille Q&A

2002 Cadillac DeVille Question: rough idle

4.6 noth star i change the plugs and wires crank sensors fuel filter code PO300 mutiple mis fire what else could this be -
Answer 1
Here is a ton of great information about the P0300 code: http://repairpal.com/OBD-Code-P0300 -
Answer 2
Try the Vacuum Hose's or Brake Booster. -
Related Items:
The EGR valve may stick open, causing a rough idle and/or the Check Engine Light to illuminate.
and apply the brakes. I experience rough idle until i start driving again.
rough idle at start up. runs okay on road
In addition when first started there is no power brake assist. I have to rev the engine to get the vacum to build. The engine seems to run fine above 1500 rpm and drives fine on the highway. Sugge...
Fuel injectors can short-circuit electrically causing a rougher than normal idle and reduced performance.