2007 Pontiac Grand Prix Rough idle when starting

2007 PONTIAC GRAND PRIX
120,000 MILES • 3.8L • V6 • 2WD • AUTOMATIC
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BUBBAYOUNG
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  • 2 POSTS
When I start the car it acts like it does not want to stay running. It's missing at idle but when you are going down the rode it drives fine. The code at the parts store says number 1 misfire. I have replace the plug, wires and coil pack. Still missing. Thanks . By the way laymen terms please.
Apr 1, 2014 at 1:16 PM
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JDL
  • ✓ASE Certified Mechanic
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Did you visually check for spark at the spark plug? If you have spark, check fuel pressure. A rough idle might be caused by a leak of some kind, vacuum leak--fuel leak--egr leak, something of that nature
Apr 1, 2014 at 2:25 PM
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BUBBAYOUNG
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Do u know where I could go for a code number reading without breaking the bank
Apr 1, 2014 at 3:50 PM
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JDL
  • ✓ASE Certified Mechanic
  • 16,098 POSTS
  • ASE Certified Mechanic
In the US some of the national brand auto stores will check codes for free.
Apr 2, 2014 at 7:11 AM
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