If you have a bad engine coolant temp sensor, the one that is mounted in between the injectors on an 88TC, that could cause it to act strange. Go to a local junkyard and grab one form an 80's Ford and swap it in to see if it corrects the problem. Mine was bad and replaced with a parts store replacement, but it never worked well, replaced with a genuine Ford one from an 80's Crown Victoria and works great now.
1988 Turbo Coupe, Black/Black, 5 Speed, Moonroof, T3/T4, ported E6, 255LPH, Kirban, Stinger Exhaust, MGW shifter, K&N, Gillis valve, BP1.5, PIMPx, Koni's
1964 Ford Galaxie 500XL, 390 6V, Big Solid cam, Headers,3.89's, 4 Speed, Vast and fast
1960 Ford Starliner, 292 Y Block, 312 4bbl intake, headers, 3 Speed, slow and low
