I have recently replaced my thermostatic actuator on a 1969 spider. THe car was set up to run essentially with a non-functioning actuator. Once I put the working unit in I adjusted it to give a near non-existent gap when hot. WHen cold there is quite a large gap. With the long rod adjusted appropirately (when the engine is hot it slightly widens the gap (0.40 mm), and the short rod to just close the air intake, the car ran with a warm idle that was smooth, but around 1100 rpm. I decided to back of on the fuel mixture screw (there is no solenoid on the '69 SPICA). This lead to a lower idle speed, but the idle is definitely rough, with intermittent sputtering. What should I do? Should I be adjusting the air intake somehow? On this car the usual valve to adjust air intake that is on newer SPICA cars is not present. I have no idea how to lower the idle air mixture. Could this be a spark plug issue (the car had clearly been running rich until I got the new actuator in). Could this be a timing issue?