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not on a 993 RS, no timing log
Moist probably ou have a vacuum problem as said before.
Remove the auxiliary blower on the left of engine, plastic all out.
Behind on top, you will notice there is a rubber vacuum hose coming from the left body panel.
It connects with a T connection with two legs. Like the Phi letter in greek.
It is from rubber, and three more vacuum hoses connect to this piece.
Grab it from middle and press it. If rubber is soft and you can press it, you should change this piece.
This piece becomes soft, and your vacuum varioram at 4500 rpm will not function if it is soft and clogs with high vacuum
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