87 5.0 just quits
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87 5.0 just quits
I have a 1987 F150 4x4 with 5.0. It starts and runs great for about 20 min then spark drops out. I have replaced coil,module and pick up 2 times. Still same thing 20 min then no spark. I also found coolant temp sensor broken.I replaced it also no change. What should I try next?