Well, the diaphragms according to my mechanic are in perfect shape, but I must check it myself, cause your diagnose fits the symptoms- it acts like if the slider would fall down, block the air passage, then with huge vacuum, lift up, and act in the cycle this way.
There were holes in the slider, but they were blanked with the sleeve inserted in them. In first posts I used word "throttle" for this slider, since in Polish we usually call these two parts the same (throttle and vacuum throttle). Sorry for confusion.
As for the snorkel, I have to check it, but if I remember right, on 1996 there were only the large ones made. But that's a good point to check. If I'll be running rich on new carb (will dyno it) I will most likely open the airbox as you suggest.
Thanks a lot for a "food for thoughts"!
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