1996 Chevy Truck Won't start !

Truck has been sitting for 3 months, wouldn't start, scan tool said(camshaft to crankshaft position correlation fault) replaced camshaft sensor, no good.
Fires right up on starting fluid, so its a fuel problem, right? Have spark, checked with timing light. Noticed tonight, when I turn on the ignition, the fuel pressure gauge is not going up everytime, but if you turn the key a little further toward the start position the gauge jumps right up to 62#, when you start cranking the engine it almost starts then the guage drops to 40#, then it just turns over with out starting. I am really thinking the ignition switch may be my problem ! Any advise greatly appreciated.

This site has helped me alot !