You are experiencing exactly what I was, except in my case it was with my 92 Corvette. I had gone thru a 2 yr period where I put about $30K into the car turning it into a road racer, but still legal on the street. After sinking all this money into her, I still couldn't get it to run right, and everyone I took it to just took my money and it continued to run the same way. Finally, the transmission went and I could no longer put it into 1st or 2nd gear, and just said to hell with it. The car has sat in my garage for 2 years and I haven't even attended a Club meeting or function since then. It just really soured me, and I just needed some time away from it.
I plan on getting her back on the road later this year, and am uncertain what I will do with the car. I have owned it for 13 years and have put my heart and soul into it (as well as my wallet), but more than likely I will just sell it for a tremendous loss. If I do that I might just be getting a pair of Jubs or Palladiums. 
BTW, glad to see you are doing ok, and hope to see you posting again. You have definitely been missed around here.
Mike
1986 La Scala’s (LS-BL) | Altec 511B's | BEC Tweeters | ALK networks | Refinished in a beautiful Golden Oak by Q-Man
NOSValves VRD Monoblocks (Maple) | Valve Art KT88's | Telefunken 12AX7 | Amperex Bugle Boy 12AU7
Juicy Music Audio BlueBerry Xtreme w/Cream (Maple) | Tele ECC801S | Tele 12AX7 | Mullard CV4024 | Amperex Bugle Boy 6DJ8
Thorens TD-124 (Cherry) | SME 3009 II | Zu Audio DL-103R
See profile for all my gear...