1999 dodge ram 4x4 5.9 v8 mag 106000 miles.

just bought the truck about 3 weeks ago. it is my first truck.

Started to stall randomly driving down the road and sitting in drive way when warmed up and idleing. so replaced what i thought it might be.. i replaced the IAC sensor first and then cleaned the throttle body(was very dirty) and then i replaced the FUEL pump finaly and here is why...

When it stalled again i listened to see if the fuel pump turned on and it never turned on.. so i waited a few min tryed a couple times and then i heard the fuel pump and then it started right up... so i figured it was the pump replaced and it just did it again... it stalls then i wait to here the fuel pump turn on after a couple trys and it starts. i am not a machanic by no means. i just need my truck help please! and it only does this when its been runing for a little while... it only starts back up when i hear fuel pump tuen on.

any suggestions on what i might do next? thanks alot

 

Swap the fuel pump relay with the horn relay. See if that doesn't improve its attitude.