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Start up problems...(4.2L v6)

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Old 01-01-2011, 12:26 PM   #1
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Default Start up problems...(4.2L v6)

Whenever I start my truck and the engine is cold, whether I am sitting in park or whether I start driving, when the engine gets to an idle, the RPM's will slowly drop from around 1000 down to around 6-700 (which is normal) but before it gets down to regular running rpms, the engine seems to shudder and the RPM gauge will go up and then drop and up then drop and shake. If you give it gas the engine revs smoothly. I already replaced all the plugs when I bought the truck in March with the Motor craft plugs. Could this be a Coil Pack going out?
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Old 01-01-2011, 02:48 PM   #2
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Is it throwing any codes?
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Old 01-01-2011, 02:53 PM   #3
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is this only when it first happening on intial start up, or after coming to a stop and idle after normal driving, or both?
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Old 01-01-2011, 08:37 PM   #4
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its not throwing any codes, and its only until the truck gets up to average operating temperature. Once the truck gets warmed up it rides just fine, but until it gets warmed up when it idles it feels like a misfire. I'll try to get video of it so I can show what I mean.
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Old 01-01-2011, 10:41 PM   #5
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its doing the same to mine. i been trying to diagnos it at work, and it looks like the idle air control is acting up. it's one of those repairs tht, tht until it breaks, dont worry about it
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Old 01-02-2011, 04:19 AM   #6
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does that mean its a PITA or Expensive repair?
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Old 01-02-2011, 04:41 AM   #7
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the part itself is about 50-60 bucks, and roughly .5 to 1 hour of labor. i just been putting it off on mine, til it finally breaks
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