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Old Aug 16, 2013 | 09:16 AM
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Dmiles2004
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Default Help with trouble code

I just arrived at work after a 25 minute trip and all was fine . As I was parking the car started to idle rough and the check engine light came on. I pulled codes and the only current code was PCM P0300. Detected engine misfire. Any insight as to what I should start checking? I cleared the code and restarted and it seems fine now, but I don't want to get stuck on my way home.
Thanks guys & gals
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Old Aug 16, 2013 | 09:38 AM
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A place to start.....pull into a dark garage (night) lift hood and start engine. Look for a light show (spark gap from plugs or plug wires and anywhere else). Start with the easy things first. Get back to us.
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Old Aug 16, 2013 | 09:41 AM
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Get a cheap Actron and keep it with you, if it pops up again, plug it in BEFORE you shut the engine off and see which cylinder is misfiring, most likely a loose wire.
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Old Aug 16, 2013 | 09:49 AM
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Thanks guys. I was just coming in to update. It was in deed a loose plug wire. Kinda corroded as well. I'm going to replace all of the wired when I get home. Any suggestions on where to buy or brand to buy? Also should I go ahead and replace the plugs as well? The car has about 79,000 miles and I'm not the original owner.
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Old Aug 16, 2013 | 10:20 AM
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Got my last set at Napa. Works fine.
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Old Aug 16, 2013 | 12:00 PM
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Thanks for the plug wire lead. Anyone with an opinion on replacing the plugs as well?
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Old Aug 16, 2013 | 01:12 PM
  #7  
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Default Wires n' plugs

Originally Posted by Dmiles2004
Thanks guys. I was just coming in to update. It was in deed a loose plug wire. Kinda corroded as well. I'm going to replace all of the wired when I get home. Any suggestions on where to buy or brand to buy? Also should I go ahead and replace the plugs as well? The car has about 79,000 miles and I'm not the original owner.
GM HP red wires are often recommended and plugs may depend on engine mods. Readers can make suggestions if you post any mods.
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Old Aug 16, 2013 | 01:21 PM
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Originally Posted by Dmiles2004
Thanks for the plug wire lead. Anyone with an opinion on replacing the plugs as well?
Got the stock iridiums at Napa too, only #7 is really hard to do. Go with the .040 gap not .060.
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