LetMyBeatPound
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Could be you ignition coil losing enough power before the system is able to compensate that your spark plugs aren't firing cauing a hiccup in the motor causing the jolt... That is super bad for your timing belt and cam system in the heads if this is what's happening. Especially if you have really good compression in your cylinders... I can't say anything for certain without actually looking at it and testing n seeing it happen but if what I described is the case becareful you don't crash a valve, if that jolt happens at the right time the stretch in timing belt will cause the valve to hang a lil and possibly cause the Piston to crash a valve... Unless your motor is a non-interference motor.
