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OK. In order for it to start and run normally, the engine in your Ranger has to have four things: compression, fuel pressure, injector pulse and ignition spark. Taking that fact into consideration, we can say for certain that one or more of those things is not there after the engine warms up.
So here is what we ned to do; first, start and run the engine until is fully warmed up to duplicate the problem, then spray a little starting fluid down the throttle and try to start it.
If it does start and runs for a couple of seconds or so, we'll know that compression and spark are OK. We'll need to check fuel pressure with a tester and injector pulse with a Noid lite.
If it doesn't start with starting fluid, then we'll need to check spark with an ignition tester.
Once we know what is missing, we would then be able to focus our diagnosis on the specific issue.
Please let me know what you find.