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I have a one owner/driver 2006 NA PT. It has no rust and has recently had a tune up and new battery. After the first start of the day, when I start it, it turns over at about 450 RPM without the usual bump up in RPM's upon cranking. Usually the car will catch and start but sometimes it will misfire for about 30 seconds and then even out. It will throw a code P300 - P304. Otherwise it runs great. It has been well maintained and has 162,000 miles on it. Thanks for any help with thus.
 

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Check battery voltage with engine off, just before starting. If it has fallen below 12V, then there is a battery or charging system problem.
 

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Welcome to the forum :)

Can you confirm when and if the timing belt has ever been changed?
 
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Sounds like a loose or dirty ground connection to me. But, I'm NOT a mechanic.
 

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If the EGR is stuck partially open, not closing fully, it will cause a lean condition that will be most noticeable when the motor is cold. The ergr still passes the OBD test as it is still able to open fully and have the proper result while driving.
 

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If the EGR is stuck partially open, not closing fully, it will cause a lean condition that will be most noticeable when the motor is cold. The ergr still passes the OBD test as it is still able to open fully and have the proper result while driving.
Thanks, I'll check.
 

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If the EGR is stuck partially open, not closing fully, it will cause a lean condition that will be most noticeable when the motor is cold. The ergr still passes the OBD test as it is still able to open fully and have the proper result while driving.
Thanks, I'll check.
I don't believe your '06 has an EGR.
 
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Hmmmm, I'd have that new battery load tested just to make you THAT'S not the issue. I've seen bad batteries come right off the rack when brand new. Rare, but it does happen.
 

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You may be looking at a small vacuum leak that leans out the air/fuel mix and affects cold starts only.
 

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It's possible the coolant temperature sensor is faulty (but not do far out of range to cause an error code) and not enriching the mixture enough for a cold engine.
 
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