A tach would have helped!
Too bad you don't have a tach in your car (or do you??) because that would have told you right away that you're missing, even if you don't feel it or hear it (my truck runs great on 7 cylinders, no backfire, nothing, you have to notice the tach needle flutter ever so slightly to know something's up again).
However my '85 GM takes a bloody hairy fit when it's not getting 99.99% of it's power. The tach needle bounces significantly indicating a missing cylinder. Then you do the usual go-around-check and you know's what going on!
2002 Spring Project
Operation "Chocolate Thunder"
425+HP 2-barrel 347ci Roller HO
Engine Sneak Peeks : 347ci
1985 Mercury Grand Marquis SS