I'm pretty sure my valves need adjusted on my f135. My in cab vacuum gauge is bouncing from 15 -20 and it has a miss. Cylinder one has no change when i pull the spark plug cable either. IS this the correct diagnosis? other than the missing and tiny bit of power loss everything seems to be functioning fine. Give me a heads up if you think it may be more then at least I won't be so surprised if it snowballs into something bigger. Also I seem to have misplaced my FSM if someone could post up the clearances for intake and exhaust that would be awesome thanks.