So Derek, does your reciept say "Jamie's Auto Repair - We warrant all work for 12mos/12k miles"?
Because a lot of shops will not warranty labor for customer provided parts. Even if they did, it would have to be a part of thier business plan, and you can trust you would pay a higher price for labor if they warrant ALL work regardless of who the chucklehead who focked up is.
If Jamie wrote down and signed a reciept saying "1year guarantee on workmanship", then you may have a leg to stand on. Crying about a friend to friend verbal aggreement for discount side-job automotive work to save you money isn't going to hold water. Jamie is not a repair center who you may be able to shaft for doing under the table non-reported work.
Besides, if you want the premium treatment, top shelf experience where the company takes the pole and the customer chooses how much vasoline to use, pony up the cash for that sort of service expeirience. Shops mark up repairs and part prices with overhead for more reasons than profit, to have a successful business a plan, accounting for contingencies is always necessary.
You are the reason for that contingency.
You got a FAVOR done for you, in the name of helping a guy with the same model car Jamie dealt with your pathetic ass. Take it from someone who is just a well-read and sensible consumer; you ain't gettin' anywhere pal. Instead of asking everyone around you to just listen to your sobbing or telling the guy who busted his ass working on your 15 year old already-been-squeezed lemon that he needs to be a man, maybe do a little research and back your verbal flatulence. I hear its a big part of being a lawyer. Take the shaft, it's yours for the taking all complimentary and such, like a free keychain, but in the bum. I hear a light smear of Preparation H helps.