Error code P0302 on ford expedition 1998
Car is sputtering and has this error code. There is moisture around the
second spark plug. Called the dealer and they mentioned replacing the
ignition coil (dealer hasn't seen truck yet). All spark plugs were replaced 8
months ago. Can I insist dealer just replaces plug without replacing ignition
coil to see if that clears the problem? I'm concerned the dealer may want
to do more work than necessary to help empty my wallet.