Ok so. When I got my engine and transmission put in my 86 I had a problem with the clutch slipping under high boost when it gets hot. I figured since it was the original clutch, and I had started putting mode on that it was just a worn clutch. So I replaced it with a f1 racing six puck clutch and. Chromoly flywheel. After that it would do it once in a blue moon. And it always does it when its warmer out. It never does it in the morning or at night. And its fine till boost hits 10-11 psi. I put the engine and transmission into my 88 and since I have a longer drive to work now. I sit in traffic a lot. And its causing trouble when trying to merge or pass. Slave cylinder is new. No air in the system that I know of, I bled it pretty well. Has anyone else experienced this problem or have any insight on this? Thanks everyone.