Sometime car barely starts runs rough till rpm's build up

Ford F150 1980 1995 Workshop Service Repair Manual Download

Get your car fix right now:))

First thought: Check the idle air control valve, or whatever its Ford equivalent is. Sometimes these start to stick and cause the rough early idle that smooths out later.

you must RUN the SCANNER/computer for better diagnostic and fix it. YOu can have some faulty like: PCM+BCM+ignition coil, sensor, etc. see the diagram attached.
God bless you

This could be due to any or all of the three sensors going bad: oxygen sensor, throttle position sensor or the MAF sensor. Connect the diagnostic tool if the check engine light is ON to find out the codes, as this would narrow down your problem.

Check fuel pressure test and air intake system.

It sounds like there could be a miss. A miss is when the timing of one or more cylinders is off, causing it to run rough and sometimes shake badly. Im not positive it's a miss, but if the distributor or distributor cap is bad, it could cause it to start weird and run rough. It could also be the spark plugs and/or spark plug wires. There could also be carbon build up in the carburetor. I hope this helps. Sorry it's so vague, but without actually being there, its hard to say for sure.

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take the head off bent valves thats for sure

run engine codes, had same issue once before it was bad computer good luck

it sounds like you have a injector leaking down into one of your cylinders so it is flooding out a cylinder thus runs rough and long cranks.

hello first check your idle with the car running foot on brake see were your rpm reading is if your below 500rpm check your label underhood for your curb idle setting second see if theres a adjustment screw you can increase were your gas cable lever rest against your set screw underhood if you feel confident enough remove your iac motor idle air control valve if the bore were the end of the pintle extracts out to close has varnish builup our carbon it will stick creating vacuum leak type senario causing stalling rough idle sometimes even no start conditions good luck