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2007 Pontiac Grand Prix Rough idle when starting

Tiny
BUBBAYOUNG
  • MEMBER
  • 2007 PONTIAC GRAND PRIX
  • 3.8L
  • V6
  • 2WD
  • AUTOMATIC
  • 120,000 MILES
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.
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Tuesday, April 1st, 2014 AT 1:16 PM

3 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
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
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Tuesday, April 1st, 2014 AT 2:25 PM
Tiny
BUBBAYOUNG
  • MEMBER
  • 2 POSTS
Do u know where I could go for a code number reading without breaking the bank
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Tuesday, April 1st, 2014 AT 3:50 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
In the US some of the national brand auto stores will check codes for free.
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Wednesday, April 2nd, 2014 AT 7:11 AM

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