First want to say thanks for the glove trick. Glove inflates barely. Pulled plugs no inflation on #4 cylinder. No antifreeze in oil must be losing it thur the exhaust I assume. Also could this be affecting start up.
have to hit with starting fluid after sitting for awhile after that the truck starts great the rest of day within 6 hrs or so. Already tested fuel pump all good there.

 

Coolant in the oil can still happen but not as likely with the new head gasket designs, usually it is just loss of coolant and overheating because of that loss
In the 'good ol' days' coolant almost always got in the oil and bearing could fry, lol

No, 1 cylinder not firing shouldn't effect start up

Try turning key on and off 3 times, primes fuel system 3 times, then try to start

1991 Fuel injection pressure should stay above 25psi for a few MONTHS, not minutes, hours or days, MONTHS, lol

If there is a leak in the system then pressure drops to 0 when engine is off
When you turn on the key the fuel ump only runs for 2 seconds, it's a safety feature, and that only adds about 10psi, so it can cause no start
Cycling the key on and off 3 times gets about 30psi

Engine Running psi should be 30-40psi on 1997 and older Rangers, 55-65psi on 1998 and up

If you don't smell gasoline then leak may be internal, fuel pumps Check Valve, or Fuel Pressure Regulators valve


Cold start requires more fuel, any cold engine needs to be "Choked" or it won't start, fuel injection can't change that, and it can't use a Choke Plate like a carb could, no Jets.
So computer must "know" when engine is cold so it can add the extra fuel to get it to start and run.
All fuel injected engines have an ECT sensor(engine coolant temp sensor), not the same as dash board temp SENDER, this is a 2 wire sensor only used by the computer
If ECT sensor is working you will know it because at cold start, engine idle will be 1,100rpm, and then over the next few minutes of running engine will warm up and idle will start dropping

Idle is control by the computer via the IAC(idle air control) Valve on the throttle body, fuel injection can't use an idle screw, you would burn the valves with Lean mix, so computer sets idle by letting in more or less air, like a controlled vacuum leak of sorts.
If IAC valve is dirty it can also make for a hard cold start, valve sticks and doesn't open or close all the way, so no high idle
It can be removed, 2 bolts, and cleaned
Also tested, with IAC valve off and it's two wires plugged in, turn on the key
IAC Valve will open all the way, unplug the 2 wires
IAC Valve will close all the way, plug wires back in
It will open all the way, repeat as you see fit

IAC Valve opens fully with key on, this is why fuel injected engines often REV up when started, computer closes it fairly quickly, but without touching gas pedal when you start engine it should REV above 1,000 cold or warm start, then drop down, unless cold