I have a 88 Ford Thunderbird Turbo Coupe in perfect garage kept condition. It was stored for 15 years, brought it back to life and now six months later I can't figure out what the hell the problem is. It happened going down the road all of a sudden the car would not go, RPMs slowly went down and then I was stuck. I replaced the fuel pump again, and the car will idle perfectly, but the moment you touch the throttle the car will jerk and die. Oddly enough if I rev and feather into the higher RPMs I can put it in 1st and take off like a bat out of hell. Driving the car down the road this way I have no problems unless I give it gas too quickly, then she will start jerking like a wild bull bucking down the street. I'm starting to lose hope for the car because I've replaced so many parts. I borrowed a buddies code reader, but on system checking it would rev the car up and just immediately die, so I could never pull codes. On the engine off test I got a 26 and I replaced the MAF, but still no luck.
Parts replaced
Fuel Pump (twice, the first pump was 15 years old, it was new, but was never installed)
Rotor and Button
Spark Plugs
Spark Plug Wires
Battery
Fuel Filter
TPS
Fuel Pressure Regulator
Mass Air Flow
I tried checking for any vacuum leaks, I sprayed starter fluid all in the engine bay, I couldn't get any rpm changes at idle.
Read more: Why does my car idle perfectly but hesitate/die immediately after applying throttle?