Andy and I worked together years ago when he was still a young pup lol, was told about Drew's Diesel through a friend that turned out to be a mutual friend, when I found out who the owner was I didn't hesitate to have him diagnose the problem, my 6.0 I thought had a failed injector, turns out I had a cylinder that failed, he saved me a ton of time diagnosing and troubleshooting, definitely check this gentleman out if your having issues!