will not start

have had evaporator issues, would not start after I let it sit a day without starting. replaced purge valve on top of engine,still problem. still evaporator codes came up. turned wrenches for over twenty two years. know what I am doing but was away from cars for over ten years I bought this as third owner clean underneath no leaks ran great four wheel works good. was in family. been running funny last few days it ran missing power not taken gas. put gas in it last Wednesday almost did not make it home. the
pump was real slow like fifteen minutes for $10.00 worth of gas. we had a lot rain that week, did not stop at station Tuesday cause tanker was delivering. so I got gas Wednesday. I thought water was in gas , yes there was drained tank. put high test in tank. drained through gas filter checked pump and it shot gas out. poured gas down body and it start until gas ran out. also replaced cap and rotor. wires are right. getting gas now but will not fire and stay running,its not smooth when it dose fire. checked fuses. never been this stumped! Is it possible timing jumped? how do I check no one top dead center look at rotor position? can someone give me direction? thanks, Cannon.