Cheuk, have you tried using a known good ECU? Mine took a dump not too long ago, was missing, check engine light coming on and off when it'd miss, etc. Swapped in a spare Motronic 1.3 ECU I had laying around and it fixed it up.
How long has it been since you've done plugs? I'd start there..
How long has it been since you've done plugs? I'd start there..
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