I just joined this club wrx.net...I mean like 2 minutes ago. Heres how my problem started...A few weeks back I went out to start the car, now this is Rochester
so its cold 6 months a year. Anyways I start the car and the idle goes to 2800, normal would be around 1700 cold and gradually work back down to 7-800.
Only this time it took forever to get back to 1200 so I started driving and I'm getting hesitation. From a stop , bringing the car to 4000 the rpms surge going to 4500 without giving gas. So It goes to VanBortel. They checked and cleaned the MAF, TPS, checked 02 sensors, checked for leaks, checked and cleaned throttle body still had the problem, so they decided it was the IAC valve and replaced it. All was good for 5 days and the hesitation, high idle and rpm surg was back. I decided to hook up the accessport and check the TPS. It should read zero when your off the gas , I take it out, reading zero cars running beautiful
then the tps jumps to 5-6 without any gas and it runs like **** instantly. So I put in a new throttle position sensor and it is still the same. It could run fine for 2 days or it could screw up 3 or 4 times a day. When it happens I have to reset the ECU which is getting to be a real pain. Any ideas other than what I've mentioned would be GREATLY appreciated.