Everything sounds good so far. The insulator is sandwiched between the intake manifold and head. It is a type of plastic and has a sealing o-ring, the intake also has a sealing o-ring. Sometimes if the o-ring splits or the insulator cracks it will cause a high rpm vacume leak. That is it will idle ok but when throttle is applied it will fall on its butt. Not being right there to see and hear the problem I would also suggest you check the variator rollers, clutch and springs. You can run with rear on stands and cvt cover removed accelorating the engine and watching that the cvt is properly working. But I would first check for the leak first.
TOM
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