Sure its not running on autochoke ,sounds like it to but if you have done a nice job on the engine then you may need to adjust the mixture on idle which for the inspection must be less than 2% it will idle well if this higher as its burning more fuel on idle but this is not allowed for the test ,once it leaves the test station ? This has one of them fish type carbs and havent done one for many a year but the mixture idle is on the base of the carb and they normally have a spring on the screw shank to hold them
SOURCE: 1983 Mazda RX7 lacks power rough or no idle
Sounds like carb idle air or fuel jets are clogged.. Test pressure with a gauge to be sure. Float level and drop needs to be exact.. Operation of the whole carb relies on this. Probably why you are not getting any change in your air/fuel adjustments.
SOURCE: the carburetor is not tuned
there are two things that can cause detonation, one is ignition timing too far advanced, the other is a lean fuel mixture, if you haven't altered the timing it has to be the fuel mixture, if it has just started doing this for no reason it could be a blocked fuel filter or fuel line or a blockage in the carby......hope this helps.....cheers.
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