Popping on deceleration

[82SC]

so this CO post has me worried...I switched my 82SC to the pre 1974 heat exchangers and disconnected the O2 sensor

mechanic said it was okay, but I have not had time to take it in to get the CO mixture adjusted....I know where the idle adjustment screw...can I do a rough approximation?

Where else besides my mechanic can I take the car to get the CO levels measured...my Porsche mechanic is so busy and charges an arm and a leg, but I do not want some retard looking at my car either...

any suggestions???