Similar situation, mine is doing the same thing. I replaced all the wires and plugs back to stock, one at a time, then changed them back to new plugs, to see if a new wire or plug is bad but they are all fine. Can't figure it out??

1998 SVT EO Silver/Midnight Blue 109k Best E/T to date: 15.670 @ 89.10 K&N Blaupunkt 10 disc CD '99 SVT wheels