why does my explorer sport just shut off going down the road on 1999 Ford Explorer

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99 explorer sport just shuts off while driving, doesnt matter if its warmed up or not,it can be 100 yards or 10 miles while driving,or in the morning when i start it it also does it!! no dash lite comes on to warn me it just boom!! shuts off:{ i changed the coil!! im thinking maybe the camshaft sensor? or module ????
(2) Answers
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i cleaned the air control valve sensor and it has not done it for a few hours,right after i did it it ran fine,then i was driving and the motor was still running fine but i pushed on the gas peddle and got nothing:} it seemed to kick back in but thats never happened juss used to shut off... i drove it like 30 miles about a hour ago and it was fine???? maybe it is the air control???