I have a 94 mustang gt and am having a problem with driving it when its cold and warming up. When it is cold, it misses really bad untill you floor it and then it acts like nothing is wrong and pulls pretty good. When it is warm, it runs perfectly. I have mallory hyfire box, msd super conductors and iridium spark plugs. All these things are brand new. I have looked at night and can not find any arcing over the wires or plugs. When it is idling in neutral, there is no problem but when I am driving. What could possible be wrong?

 

get rid of the iridiums