OK, so I have a 2000 4.6 gt. I made the stupid decision to clean the engine off. I started it up and it started missing, drove it around and it didn't clear up. Popped the cel light on, scanned it came up p0305(misfire #5 cylinder), pulled the coil pack out and it looked dry. I switched it with #6 cylinder the miss went to #6 so I got a new coil pack and put it in its place. The miss went away from that cyl. but then I got miss for #2 cyl. I pulled all the coil packs and blew out the heads with air and dried everything out. Put it all together now I get a p0300(multiple misfires). It gets worse when it warms up also. I'm out of I ideas short of replacing every coil pack which is my next move.