My car did the same thing could not find the problem took us several trips and hundreds of dollars then my cars dash started flashing all lights on and off on the dash like a strobe light it was the ignition switch there is a video on you tube videos posted about this that will show how to take off the dash and replace it several times I found myself going anywhere from 40mph to 60mph and the car shut off on me it no longer does this and the dash lights work fine.
it needs a new throttle positioning sensor
I would check your Ignition Module. That's the first place to look.
Have vehicle scanned to see if any codes are stored to determine the problem
Why engine stalls on 1993 Chrysler Intrepid while driving and sometimes at stops?
Because it's old
sometimes, but not while driving
Check Battery connections are clean and tight. If they are OK, then the problem lies in the relay mounted in the starter (it is one unit)
Fuel pump failure is one possibility.
Check for spark & fuel when it's dead and go from there.
Over 20 psi at idleUnder 80 psi while driving Over 20 psi at idleUnder 80 psi while driving
Texting skills sometimes kill!