When my car sits in nuetral,or park it idle's up and down .. the timing is dead on,ive checked all the hoses and whatnot for leaks thinking it could be a vacum leak sumwhere...When Mike(from masupras.com) looked my car over we came to the conclusion that there had to be a wire frayed between the TPS,and the ECU. today befor i left work i ran wires from the TPS to the ECU and it did the same exact thing....any of u have possible solutions to this??