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Re: Strange problem with 6L
intake leak would normally but not always also throw a lean code. since it is also throwing a p0355, would be a good idea to check the connector and wires going to that coil pack. if those check out good, could be a bad circuit in PCM. i know you replaced the #5 coil, but swap it with another cylinder(#3,5,7 or whatever). if the coil code moves to that cylinder, then you probably got a bad coil....even new it happens. if doesn't move, further examination of wires and such is needed. post back what you find. also, pull #5 spark plug and see if it is kinda black looking...would indicate either too much fuel or not enough spark to burn fuel going in.
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Disclaimer: I am not perfect, i may be wrong in my advice from time to time. Also note that any advice given is as is with no warranty whatsoever, and i have zero liability if you get hurt for not being safe while working on your vehicle.
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