Missing when hot

[94expo]

Im trying to narrow this down. It sound like a miss on one of the plugs. You can here it when its cold and when it gets hot its a Dog. Taking off from a stop sigh you can really feel the sluggyness and missing. I put Bosch platinum 4 plugs in. I understand they may not be the best for ford now that there in.

 

[MrShorty]

If it's present at idle, you can do a cylinder balance test and see if you can isolate to one (or more) cylinders. With the engine idling, pull the spark plug wires one by one and see how each one effects the idle. If pulling a plug wire has no effect on the idle, that cylinder is dead. If the engine lopes worse upon removing the plug wire, then that cylinder is good.