Quote:
Originally Posted by post_break
It doesn't do this when it's warmed up.
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Putting aside for the moment the fact that the engine and engine management system on these cars maybe be crap, is it possible that you are dealing with a situation that only happens when the car is in "Choke" mode? In other words, because the car is not yet up to running temperature, the ecu is mixing the air/fuel to accommodate a cold engine. When you step on the gas, you mess with this (because the "Choke" setting works best in neutral at idle) and when the car is fully warmed and out of "Choke" mode, the problem goes away.
Obviously, I'm guessing here, but I have experienced a very mild version of what you have, and I have experienced it on many fuel injected cars with ecu. The FT-86 needs better sensors, a better feedback loop, and better fuel mapping. Not your problem. Toyota's problem.
P.S. Concerning Choke mode, there may be some alternate timing changes going on, too. I'm not am expert. Others here may know.