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Just put some cheapy plugs in it and see if the problem goes away. If it does not, the next step is start replacing ignition parts, like coil packs. camshaft angle sensor if you have a spare. Igniter if you have a spare. Coil pack harness. Could always be something in the harness rubbing something else of course, but you wont find that unless you start taking off the tape and looking at whatever's down there.
Is the misfire constant? Is it like turning on a switch that stays on for a little while? Or does it happen real QUICK and then stop suddenly just as fast as it started?
And does it feel like a single cylinder? would be great if it was just one cylinder coil pack going bad.
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