My 1989 non intercooled cummins ran great today and then when I went to take a corner it died on me...I started it back up and it would not idle without dieing but when I kept throttle on it from in the cab it would run fine...went to drive home and the truck wouldn’t go over about 15mph seemed like it wouldn’t go over 1000 rpms or so...pulled it inside primed the pump changed fuel filterand it idled way high I’d say at least 2k but now it’s doing he same thing again....need help