I am running the stock turbo II on a 1988 engine like you.  I did some taxi testing last fall,  now the plane is inside for finishing.  I am installing the EM2 at the moment.  I also am using Tracy's EC2.  I have not done any programing on it and it works just fine for me.  I have run the engine from about 800 rpm to 4 000 rpm with no hit and miss, the engine is smooth.  If the mixture is not right it will run rough.  Hope this helps!