Coil is certainly a possibility, as are the ignition amplifier module, the hall switch inside the dizzy, throttle position sensor, or even a momentary hesitation of the fuel pump (pump or relay fault). An iffy wiring connection almost anywhere could also be the culprit, which can be REALLY difficult to find !
As Leeboy says, you would probably be well advised to get some professional diagnostic help here, having already attended to the sensible basics. Have a look in Y Pages under "Car Engine Tuning", or "Engine Tuning", if you don't know of anyone already.
Regards, Adam
Whatever is rightly done, however humble, is noble.
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