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Hey! My name is***** have over 13 years in the automotive industry. I have seen numerous vehicles come in with numerous different problems. Read your description, I mighty have other possibilities.
What is the fuel trim currently at when it misfires?
Have you smoked check for vacuum leaks? (did not see any mentioning of testing out the vacum system)
How does the throttle look? No carbon build up?
What about the egr ports? All clean?
No intake leaking?
How about the crank sensor, did you scope it? No glitches?
No cats clogged? did you test them?
TPS 5 v ref?
If you have any other questions, I will help to the best of my knowledge. If all test is good, then I will gladly opt out & let another tech try for I would then run out of possibilities.
What is the fuel pressure koeo, when it misfires and when the engine drives fine
So you checked all that? Did not see that in the description, was not trying to patronize you as well. I was just trying to help an experienced technician with knowledge, (sometimes A tech will overlook something, its happened to all of us experienced technicians). I will opt out & let someone else try, was only attempting to help you. Did not mean anything beside helping you, my apologies. I know you will be requesting your refund, (that is completely fine), but please look over what I have stated, for I have seen a lot of misfire caused by something like that. Please scope the cam/crank make sure its within time (which I am sure it will be, i've seen one tooth off timing cause a non misfiring vehicle to misfire on the ecm)
If you would like to talk to a real tech, let me know ans we can work together to see what is going on with your customers car.