well my buddy has a 95 f150 with a 351. when its not fully up to temp when running, no matter what the throttle is at, it will miss for a split second then come back then itll do that again, this repeats when on the gas on and off until the truck is completely up to temp. i changed his plugs and wires tonight so i know thats not it. timing? stretched chain? new distributor cap? and ideas would be great guys.

 

New temp sensor?

 

Are there any mods? Is the CEL coming on?

 

no cel and no mods. completely stock exhaust except for an open y pipe. which sounds pretty neat really

 

Open Y pipe with or without cats?

 

without cats. been like this forever, never had any trouble. your thinking valves arnt you. this came up once before. hmmm