My Ranger has once before done this. It started cutting out when going down the highway. RPMs drop about 500-1000. Does it and then is fine for a bit and again. Only does it when it is ran for a while (30min +) or short rides and it sits for an hour or two and when restarting. I replaced the fuel pump relay and still having the issue. checked wiring from fron to back as far as i can without dropping the tank. I get no check engine light withthis happens and I was told by more than one person that without a light the OBDI will not find any trouble codes.
I checked and bypassed the rollover switch in the cab too. I can hear the fuel pump run when the key turns on even when it starts and then dies after a few seconds. I tested the coil and seems ok too. Check tps sensor and even ran it with it unplugged and still got the cutting out. Going to check fuel pressure tonight with a borrow guage (if it fits).
Any other ideas. Poor college student so cant afford to bring it in.