Hi.. I had my head gasket replaced a couple of weeks back.. that seems to have increased given the car a little more boost (or am I just imagining it...) Anyway, the car now seems to have a hesitation in the auto transmission, when I step on the accelerator hard, it won't shift into gear and just revs up. I have to depress the accelerator gently to allow it to "catch" so to speak. Anything too quick results in gear not shifting. Anyone had this before? I am thinking of reseting the ECU by disconnecting the battery. Any thoughts on this?