Not Ranked
You didn`t say if it is a carbureted car or FI ... however , I would lean towards the fuel at this point . Summer fuel mixtures , heat and ethanol cause problems . If the car has a carb , check to see if the idle air corection jets have an ethanol buildup ... and the easiest way is to spray some carb cleaner through them . At 1900 rpm , you`re still in part of the idle ckt if you have a Holley , and the ethonol can cause what you are seeing . As far as the MSD location , that`s where mine is located and we have ambients here in the upper 90`s to low 100`s and no problems . Yes , the MSD boxes get warm when operation , but you should be able to comfortably hold your hand on it . Another possibility would be the MSD module in the distributor ... if you have an MSD distributor .
Bob
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