I had a really bad head gasket leak on my stock gsr head gasket. I bought an aftermarket head gasket from summit racing (copper) and installed it. I torqued everything to spec. I drove it maybe 15 miles and looked at the motor. Its leaking around the head gasket again. Does it need to be re-torqued after driving? Also, I got the bottom of the head shaved to help seating. The motor overheated quite a bit before the installation of the head gasket, but someone said it would only warp the block if it stayed really hot. Help would be much appreciated on this situation.

Also, my tps sensor is bad, so if anyone has one to sell I would buy it from you.

Thnx