[pat052003]

I have a 90 ST and everything under the hood is practically brand new, radiator, distributor, alternator, timing belts, battery, intake & exhaust manifolds, injectors, fuel rail, spark plugs and cables, water pump, oil pump, a/c compressor & drier, brake booster and master cylinder, and new clutch. And on top of all that I just had a 3 angle valve job and port and polish done to the cylinder head. The car only has about 26k miles more than yours and it does the exact same thing. Don't quote me on this and there may be someone in here that would know better than me, and you could also even call a Toyota tech. and ask him, but if I had to guess I would say it had something to do with the way the CPU is programmed, and I am about to have mine reprogrammed so I'll let you know if the problem ceases afterwards.