I have a 2002 WRX 99,000 miles with a VF39-pinks swap and I was driving it around with the Cobb map for a few days with no problems. I went to get my car tuned and it was only putting out 189whp and both me and the tuner knew something was wrong so we stopped. We thought it was a boost leak and I did find a few small leaks at some clamps. Tightened. Went back to tune and it put out the same numbers and started pouring out white smoke. Found my IAC gasket was leaking coolant into the throttle body but there was very little leaking. Was driving it home and was going very easy on it and it was driving fine and started to hesitate and then drove fine. About 20 minutes later the car lost all power and died and would not restart. I thought maybe my timing belt had skipped but just now as I took off my timing cover and lined up the marks it is timed properly.
I am completely clueless and don't know where to start to look for the problem. Any help appreciated!!!!