Figured out my intermittent misfire

Right around WF10 I had replaced my opti and still had an occasional intermittent misfire. It would come and go, often dependent on which direction the car was accelerating. I finally discovered it. When the car was warmed up and idling at its usual low rpm, I was parking it in the garage when I heard a ticking coming from underhood whenever the car would misfire. Well, I put the parking brake on, put it in D to slow the engine down, popped the hood, and quickly located the misfire.

It turns out that when I did the water pump and opti replacement, I also removed the AIR pump, its bracket and associated piping, except that I left the big U-tube in place. Well, turns out the U-tube was loose enough (the AIR pump bracket helps support it) that it was flopping around and would occasionally touch the #2 plug boot, shorting that cylinder out. So, for now I bent it out of the way and now the car runs fine.

Gotta love it when it's THAT easy.

Nice! Saw that tube in half and get it out of there...