I have the same problem with my speed density 87 aod. Check your cooling system!!!! Does it do this when the car is warmed up? Or does it do it when you first start out? Please be more specific. I thought it was my ignition, fuel system, or vacuum leaks. Replaced every damn thing and still have the same problem.
Car: 1987 LX Coupe with 5.0 option
Engine mods: Banshee Ram Jet shaker hood system with AFM PowerPipe, BBK equal length 1 5/8 shorties, 2.5" catted h-pipe, 2.5' Super 40 Flowmasters, Be Cool dual electric fan, March Power and Amp underdrives, Powermaster 140 amp alternator, 180 thermostat, 12 degrees of timing, battery in the trunk, Aeromotive adjustable fuel pressure regulator, BBK 190 lph fuel pump. MSD 6AL box, MSD 8.5 Super Conducter wires, MSD Blaster coil.
Transmission: Stock AOD, Transgo shift kit, B&M tranny cooler, B&M 7 quart tranny pan.
Suspension: Steeda aluminium upper and lower control arms, KB subframe connecters and k-frame brace, Steeda drag race bar.
Wheels and Tires: 17x8 Mavromont Chrome Pony R's, Bridgestone Pontenza S03 Pole Position 245/45z/17 tires
Rear end: FMS 4.10's