IME This is 100% normal with the throttle body modification that you have done.. My question is what kind of vacuum do u see at idle...
After the car warm up does it idle fine on its own?
I manual set my idle to about 1000RPM (by adjusting the idle set screw on the throttle body).
As long as this is all related to the thermowax you wont have any problems with your engine blowing up.
This was exactly how my engine ran after I did my last build.
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