loss of power at highway speed
i got a stock 250 with 292000 miles on it it runs strong in the city and perfectly fine on highway for about 15 minutes... it does have a weak injector. but while driving at highway speed for a while the SES light comes on and it loses power. i pull over on the side of the road and let it sit for a minute and turn the truck off and restart and it will drive fine for about another 4 miles or so with no SES light. then it happens again.... i checked the oil and its full. any ideas?