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if you're getting a bad misfire then its likely to be the variable compression I'd suggest to try squirting a little engine oil into the bore and then see if the compression pressure leaps up and is consistant then its a sticking piston ring or scuffed piston
if the oil makes no difference then its likely to be a burnt valve seat
and in which case can be repaired by removing the head with the engine in the car and then replacing the valves on the problem cylinder and recutting the valve seats
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