I have a 2000 mustang
gt ,I bought some pi heads and mild cams . I had it sent out to a machine shop to get some work done had it installed and it had a code for random misfire that wouldn't go away. I did a compression test and in cylinders 5-8
It had 100-110 on 1-4 I had 170 all across and it's running really rich . Anyone know what it could be ?
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