Cylinder 5 misfire

[Francis D Gunseor]

Hi I'm new to this so please forgive any mistakes I might make but I just bought my second expedition it's a 1997 XLT 4.6 my first was a 2000 5.4 and the tranny started going out on that it was the 4r100 and it was cheaper to go buy a new expedition than to rebuild their replace the tranny so I got this 97 4.6 and right away the check engine lights on so I assume and I was right it's a misfire and cylinder 5 what should I expect what do I need to know going into replacing these coil packs and spark plugs is there anything you can tell me about the 4.6 engine that I need to know

 

[docraymund]

Before anything else, remove and check#5 spark plug first. It might just be fouled.

 

[riphip]

Also check for bad vacuum hoses after that. When they get old, they deteriorate & crack from the heat of the engine.