Gilly, Thanks for the informaton. The AIR injector was right under my nose! I pose the same question for steve to you - about that 4 inch plastic tube...it must have something to do with the AIR, as that tube snapped while I was changing the plugs (my gut must have leaned on it). :-)

Would that be the culprit? Would I have to buy a 'system' part just to replace the tube? I used duct tape to reconnect/seal it back up.

Thank you again!