Hey all, I am new on the forum and have a 1990 pickup. I recently rebuilt the head, put in an rv cam with new rockers. After getting it put back together I can only seem to get sporadic heat into the cab. It gets cold hot cold hot and so on. I have all the hoses hooked up correctly and the truck runs at the proper temp so I can't figure out whats up. Also the truck pulsates at idle until it gets good and warm (maybe related?)......any ideas? Really appreciate the help.