Engine miss fire issue 2000 4.6

[clinchfield33]

I have a 2000 4.6, replaced all the plugs and coil packs. Sometimes when I start the truck now, it will miss fire bad, I can cut the engine off and restart and it will run fine. Which direction should I look, which part may need replacing? Thank you

 

[Billme]

Reseat fuses, ignition switch would be my choices

 

[clinchfield33]

Thank you Billme

 

[TonioBicicleta]

Sometimes water gets into the wells of the spark plugs closest to the firewall. But that would persist even if you restarted the vehicle. It's worth checking though.

 

[clinchfield33]

Thank you

 

[jr1under]

Sometimes when I start the truck now, it will miss fire bad, I can cut the engine off and restart and it will run fine.

Can you run a scan while it's misfiring? My 1999 5.4 had identical symptoms a few years ago, more than once. The scanner would reveal a P030x code even though the CEL hadn't come on. The x is the cylinder #. New ignition coils were the problem and the solution, no issues since.

 

[clinchfield33]

Thank you, I will run a scan