97 gt

I have my 97 GT with a brand new fuel pump and the RCM. The crank with no start issue has come and go for a couple months bur now its dead. It will start if I put starting fluid down the throttle body so I know it has spark. I'm really stumped and do not know what to check now. I've tried...

Frustrated Husbands stang.97 gt with 99 4.6..bare w/me trying to help hubby.the initial problem was the hose to temp sensor thats located on back,busted.replaced hose&sensor.never overheated but temp to high.so replaced thermostat.still to high.tested fan.runs with front temp sensor...