2000 V8 #6 cylinder misfire

For my son...
Replaced the plugs, boot and springs.
Problem goes away for a short period after code removal but comes back.:banghead:
Then replaced #6 fuel injector.
Problem goes away for a short period after code removal but comes back.:banghead:

Could it be the plug was fouled before replacing the FI for that cylinder?
Going to replace the plug now.

Found that it was the coil. Running good again. Sorry I posted this in the wrong area.

i was about to say those coils tend to go bad but it seems you found that already, good luck w/ the car!