Truck stalls at stop, restarts - 1990 Dodge Ram

sounds like a fuel problem

Or a Vacuume leak do you have a check engine light? Typically your TPS "throttle sensor" will throw a code when it is faulty

I’m happy to assist further over the phone at https://www.6ya.com/expert/brock_d67526d2a834c47e

did you check for vacuum leaks in any of the lines or intake gaskets?

have vechicle code scanned bad engine coolant temperature sensor will cause vechicle to stall out and hard to crank when cold.

Check your fuel pressure if its not within specs replace pump.

If it's an automatic, it could be the torque converter solenoid. Symptoms are stalling when coming to a stop after reaching speeds of 40mph and above. If it restarts immediately then stalls after putting in gear, that's what it is.

mcdvito75 Here, Sounds like an idle speed motor or the idle speed sensor. Have your local shop check it out.

This sounds like a classic case of either a dirty/faulty IAC (Idle Air Control) motor or a sticking EGR valve. If you can prevent it from stalling by keeping your fot on the gas slightly and it always restarts right away and runs good when restarted, I'd suspect the IAC first. If it "chugs"when stopping and will run rough even with a little (not a lot) of gas pedal and/or it runs rough when restarted, I'd suspect the EGR.

check for vacume leaks most common problem for symptoms listed its hoses on engine look for dryrot cracked, or broken hoses or lose come off

adjust idle speed