Google crank sensor problems.
The tone ring isnt tight on the crank, and it will move a little,and cause it to do a timing correction,causing a momentary stumble. buddy’s truck will stall when its cold, or it will run rough right at first start in the morning.
Dont know if it has a fuel pump control module,instead of a pressure regulator it slows pump down if its at idle. Located at rear of vehicle. Housing isnt sealed very well and moisture gets in. Corrosion eats the copper around the torroid coil and eventually the circuit opens. Then no gas at all. I jumpered the coil.
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