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Discussion Starter #1
i have a 02 mustang gt. 4.6. runs like crap at idle but at higher rpms its fine. check engine light says cylinder 4 misfire detected. changed plug. coil and boot. still same problem. did a compression check and its bout 50 psi lower then the other cylinders. any helpp?
 

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Head Unicorn
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5,085 Posts
not good at all....... It could be any number of things. broken valve spring, bent valve, blown head gasket, cracked head, broken rings......... bad though, whichever it is.
 
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