i have a misfire after tune up

2005 SATURN RELAY
6 CYL • 2WD • AUTOMATIC
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ADAM HARTWICK
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i changed my spark pluges after it was done it was fine. then i was sitting at a light and my engine light came on. so we had it scaned and found it has a misfire do not know which one is misfiring can you help.
Sep 18, 2011 at 6:39 PM
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JACOBANDNICKOLAS
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What trouble code was found, P0300 or something other?
Sep 18, 2011 at 6:41 PM
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ADAM HARTWICK
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not sure
Sep 18, 2011 at 6:42 PM
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ADAM HARTWICK
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only one is misfiring i think
Sep 18, 2011 at 6:52 PM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
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PO301, PO302... indicate what cylinder is missing.
Sep 18, 2011 at 7:02 PM
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ADAM HARTWICK
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  • 11 POSTS
i think p0302
Sep 18, 2011 at 7:11 PM
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JACOBANDNICKOLAS
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That would be cylinder 2. Remove the spark plug and check to see how it is burning (what it looks like) and let me know.
Sep 18, 2011 at 8:22 PM
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ADAM HARTWICK
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  • 11 POSTS
Would using NGK spark plugs cause it to misfire should I use ac delco
Sep 19, 2011 at 5:17 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 POSTS
No, that shouldn't cause the issue. They are good plugs. However, anything is possible.
Sep 19, 2011 at 10:13 AM
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