low down miss

over the last week my zr 1.4 has developed a tiny misfire when jumping on the gas at low revs, its hard to explain really but it seems to do it at part throttle, and also if you blip the throttle right down to rev it, its more noticeable if you are in a higher gear and suddenly need more power, it has the miss [like one cylinder] then goes fine, if I plant the gas on full its ok [full load]



put my code reader on it this morning and nothing showing



I have some spare plugs that I am going to put in tomorrow



any ideas?

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