is there a way to set the idle higher from in the cab other than computer, i know on tractors u can set the cruise and itll keep the idle whereve u want it

 

An exhaust brake will help keep engine temps up. Raising the idle is very important, letting the engine idle for long periods in cold weather will lead to engine damage. The "running rich" you noticed is UNBURNT FUEL. That fuel will wash the oil off your cylinders and cause damage to them.