I would hate to see a guy go to the effort of changing the cam when it was just something simple like a tank of bad gas or the gas tank vent is clogged. So I guess my advice is to verify all of the simple dumb stuff before tearing the engine apart.

I might be overly sensitive to the issue since lately I've had a bunch of customers come in for "EFI problems" and none of them turned out to be EFI problems. One guy had a broken valve spring, one guy had a loose connection on his coil wire, one guy had old gas in the tank, etc. In all cases the engines ran poorly and since the cars had EFI they just assumed that the "EFI system was acting up". And the last guy that came over to have me look at his EFI system had the timing retarded by 12 degrees. So not an EFI problem after all, just hadn't ever checked the timing.