starting problem

[Mr. Lav]

Every once in a while my bronco wont start, checked spark and no spark, then it starts right up. I thought it was the dura spark so changed boxes, it would be fine then it acts up doing the same thing, switched over to the msd box and then the same thing. when it has no spark I check and it has power to the boxes but no spark. could it be the coil or the dist. and yes I have three ignition box's under the hood you just never know out hunting if one will go out. Thanks for the help

 

[broncnaz]

Good possibility its the dist. Usually coils either work or when they heat up stop working or they just dont work period.