A dirty flap or just a loose rubber!!
If the flip is a little reluctant to move, it may not just be dirty, the flap need suction from the engine to make it move in the first place, so it may be because the large rubber bellows may not be fitted properly or the large jubilee clip has become loose allowing any air sucked in by the engine to bypass the air/fuel distributor altogether.
The K-jet system is almost bulletproof, but simple thinks like loose hoses/piping/wires (all easily overlooked from time to time) can bring the whole thing crashing to a halt.
Rusty
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