How to initialize the model???

I built up a vehicle model using simulink. There are basically 2 outputs which are again given as feedback(as a input) to the system. Now i want the model to (start) run from its inital or static value of its output for e.g 0.06. how to do this??? I use memory block with initial value of 0.06 but even then also i am getting values of those output as: 0, -Inf, 0, NaN and 0, NaN, NaN,NaN namely. why this problem is encountered??? Please help me...??