My 1987 F250 eng.460ci . It stalls while driving and idling. And hard to get back started ack like no fuel but I replaced both fuel pump and fuel relays and tune up

SOURCE: HARD TO START WHEN COLD AND WHEN IT DOES IDLES BAD AND STALLS.

Try replacing the ignition control module it is located under the distributor cap Cost is around $30.

SOURCE: On a 97 F250. Where is the fuel pump relay located?

it should be the small green relay that is on the inner passenger side fender

SOURCE: wont stay idle

The idle solenoid must have gone bad. have an expert come fix it for you.

SOURCE: 87 F150 sputters and stalls after driving about 20 to 30 min.

Dual tanks sounds like one of them is letting air into the line. Had the same problem and when one tank was empty it would let air in to the line making the truck stall out and not start. Had to keep at least 1/2 tank in the one. Might want to change out the tank switch over.

SOURCE: After start, eng. shakes at idle. 2001 VW Jetta

if it has a 1.8 coils are bad but check mass air meter and throttle as well