Starts fine when cold runs good. While its warming up it misfires if hammered but if babied drives like a dream. after driving for a 20 to 30 mins it just stops running. no misfires or slow power down shut stops running and wont start again till after it has had a chance to cool ... not so much as a pop or ping. replaced inginition pack and control module spark plugs and wires. when warm it will turn over but its a no fire . please help.