Missing at interstate speed
Hey guys. I've got a 90 ranger with a 2.3/5 speed. when i got the truck, it would drop in rpm and lose power. i replaced both coils, plugs, wires, ignition module, IAT sensor, ECT sensor, EVP sensor,EGR valve, thermostat, and MAF sensor.I have also replaced many of the engine harness connectors that were broken or butt connected. all parts are factory ford and motorcraft. it does not lose power & drop in rpm anymore. the truck runs much better now, but still has a miss in it at around 65 to 75 miles an hour. if i downshift into 4th gear, it wont miss, but if i'm in 5th, it starts missing & hesitating. fuel pressure is fine.anyone have any ideas about what the hell is wrong with this damn thing?????