I have a 98 neon that I race on a dirt circle track just wanting to know if anybody can tell me what the ECU controls in an atx other then just a lower rev limiter?

 

It also controls TC lock up. I have used auto computers on a manual before if thats what your asking.

 

If it's like the early 2nd gens that still had a hydraulic transmission set-up, using an auto computer with a manual resulted in a lower rev limit. I've seen people report a TC lock up code with no drivability problems and then just grounding the neutral safety switch.