I have a 06 f150 I changed the plugs at 47,000 miles about a thousand miles ago because of loss of power missfires and fuel mileage. still having the same problem. codes say that intake manifold runner bank 1 stuck. Someone had told me that it has to do with the throttle position sensor. which makes a little sense because when I punch the throttle it has like a 4 sec. delay before it kicks in. anyone have any advice?

 

Your truck has "Variable length intake runners". You need to bring it into Ford so they can service the solenoids.

 

shoulda went with Chevy or Dodge, U woulda been problem free.