A co-worker of mine has a 1998 F150, 4.6 with 158,000 miles. He says the CEL shows a vaccuum leak but he didn't remember the actual code it threw. Any ideas? Does the 4.6 have the elbow on the back of the intake that can be a problem like the 5.4? Thanks in advance.

 

Pull the codes again. Autozone freebie, Best way to go.