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Have you checked which tune is loaded?
It must be the 'TOR' tune which is loaded.
The original tune is set to 'lean' out the mixture at constant revs, when it reaches the leanest fuel mixture it adds a bit then leans out again causing this surging feeling. Does this make sense? It's the easiest mod, just let your dealer check it out before you spend money and time on something else...
Chris.
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