Was running turned it off now it will not start. It's getting gas and spark on 1998 Ford F-150

Went into store came out will not start

Asked by for the 1998 Ford F-150
Check and see if there is pulse on the injectors. It sounds like it could be your anti-theft system. Another possibility is your timing chain jumped when you cranked it.
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Just replaced a timming chain on my 1998 F-150 4.2L. It was getting fuel to the plugs and was firing. Big key to timing was it backfired while I was trying to crank it?