hi i have a 1997 ford f150 4.6 i bought the truck for 900bucks knowing that there was a missfire, verry clean truck loaded power everything but any way the guy told me it needed an ecm so i bought an ecm and that didnt work so i bought 2 new coils that worked for about 10 min no missfire had alot of power but then it went back to normal so i thought maby i fouled some plugs so i bought all new plugs and that didnt work. then the next day i started the truck up it had its power back for like 5 min that right back to normal and it only has power when the engine is cold or has cooled down. and sometime the door locks go crazey idk if that has to do anything with it or not but i think that that is kinda weird and also there is a wierd raddling noise comming from the top of the engine idk what thats about eather but it dont make that sound when its running good. can someone please help me i dont want to keep putting parts into it untill i find out the problem thanks

 

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