It's your K-Jet, most likely the 'piston' that moves up and down and is operated by the round flap.
Remove the metering head from the top of the airbox, turn it upside down, then you see 2 bend pieces of metal, open them up and take the piston out, don't loose the spring that's behind it! Clean it up and polish it and put it back in.
However now I come to think of it, try to adjust the CO first though the small pipe on the metering head. This helped on my 90q the last time I had this issue. The screw can be turned with a small hex key?
Anyway, start the car and keep it running by operating the throttle, give the CO screw a half turn or less left or right and see if it helps.
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