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Yea, the air in the coolant is usually more of an erratic idle but your mention the motor missing/vibrating which makes me think something is amiss in the combustion cycle. My next suggestion would be to examine/test the fuel pump and FPR. When my Saab's pump was on it's way out at idle it would vibrate gently and every few cycles of the motor it 'hesitate' and the idle would drop close to 200-300 just for a second and blip back up. How's your gas mileage? Oh and one more random thought is to make sure yur knocj sensors are working properly, but normally any failure of these would throw a code.
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86 Saab 900S Coupe 5MT
94 Acura Legend GS 6MT
04 Subaru Forester XS A/T
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