JUst got a 94 Z and its having problems. Once it warms up it misfires. WHen i am at a stop with my foot on the break it tries to take off on me. Once i try to accelerate it just bogs down and misfires badly. IVe replace all plugs and wires, cap and rotor, TPS, fuel filter, IAC, and MAP sensor. Now its worse. Any ideas?

 

Coil, Opti, or MAF???

 

How can i test those?

 

If the MAF were the problem then just unplug it. The engine would smooth out. As far as the opti is concerned, you changed the distributor portion of it but not the optical portion of it. The only way to test for a perfomance problem with the encoder signals is with an oscilloscope. Not practical. The coil could be breaking down and there is no real performance test for that. They aren't very expensive.

I think you should scan it for sensor inputs. For example if the engine temperature sensor were low, the PCM would think the engine was always warming up and keep it in open loop. A scan of the sensors would show such a thing. That's just an example, however your problem appears to be in closed loop.