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Jim listed the most common symptom. It can also cause a no start where there is no tach reading while cranking but that could also be caused by other things. if the wait to start light comes on with the key but no tach reading when cranking then it could be the CPS.
It can do many wierd things too. I have seen them cause a stall in the rain, Stall with a trailer hooked up and you hit the brakes. Stuff like that.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.