Update...Rep sent gaskets and seals for my mechanic to pull the head off to check for a slipped cylinder sleeve...at least I think that's what he said. All was good with that. Now new fuel rails are supposed to be delivered probably today. Really getting frustrated with the whole process. Mechanic says that the rep wants him to send the air injectors off to be cleaned and flow tested. Said he was going to put the new fuel rail on first to see if it fixed the problem before sending off the air injectors for another two weeks down. Don, if it seems to you that an obvious possible cause of my problem is the tps or the map, then why in the heck hasn't it even been mentioned by the rep? Doesn't make sense to me.