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Just to clarify, when you swapped the coils #4 & #7 you swapped them with other coils not each other right? lol Finding a good shop with great techs is about as easy as finding a good doctors office with good doctors. Sounds like you could have did the troubleshooting and repairs yourself. Any decent shop will not repair based off of someone elses diagnostic. You bring your car to me, I diagnose and I fix or you go somewhere else. Sounds like they should stick to doing lube jobs.