There a lot of things working against ya, the whole intake and exhaust system is optimized for 2.2L , running only 1.1L and intake manifold plenum and TB are to large along with exhaust system pipe diameter .
While the ECU will try to keep idle rpm at 800-850 (whatever stock spec is ) a 2 cylinder would probably need at least 1000 -1200 to get flow velocity up a bit .
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