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Missfire problem



  172
Hi,

I have had a problem for a while with my 172 missfiring. A couple of months ago my coil pack went and it was on 3 cylinders.

I changed the coilpack along with NGK plugs. The car seemed to be okay again until i drove a few miles. Once the car heats up it missfires again!!

This has been happening for a month or so and is really doing my head in. I cant understand why it runs perfectly when i just start it and its cold.

Could it possibly be the leads or a duff coil pack again??

Thanks

Yuillr2
 


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