does the idle drop if you pull a wire on every plug? in other words, at idle with the miss. pull one wire note the idle drop or not, pull the next, note the drop, keep pulling a wire, and replacing it until you have gone through them all, and note if one wire has little/no effect. then pull that plug, and see if it is fouled or otherwise showing signs of oil/fuel contamination/wetness... you could have a burned valve in one hole, or worse.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!