What cylinder is the misfire? When's last time the timing belt and all idler pulleys were changed? I had similar issue engine would suddenly cut out only at freeway speeds, turns out one of my idler pulleys broke apart it's plastic lining and the timing was jumping causing the engine to cut off.
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98 Millenia S 2.3, cabin filter mod, Valve Covers not Leaking, working tilt, New timing set, waterpump, 17" Rims, K&N drop-in filter, HIR2 9012 Headlights, 12" Diamond D6 Subwoofer, GroundShaker Ported Enclosure, Kenwood 1200watt Amp, Blutooth