Just put a new power steering pump in my 1990 Bronco 5.0 and now the serpentine belt slightly slipping off of the crankshaft pulley. I replaced the automatic belt tensioner, and put a new serpentine belt on, but I am still having the same problem. The pulley is on flush, and everything was put on exactly how it came off and torqued to specifications. Any suggestions on what the problem may be? Id hate to pay someone to fix it after I already put so much work into it.