Power Steering Pump problems of the 2010 Dodge Ram 2500

We purchased a 2010 Dodge ram cummings 2500 on 06/20/2011. Weeks into making the purchase we started having engine problems. Such as a clogged fuel filter, egr valve, the ignition key switch, truck would not start with turn of the key, you had to wiggle key inside ignition to start truck. The check engine light is always on, recently the message panel displayed exhaust is 90% full. The truck was going about 5 miles per hour. And recently it turned off on the way home barely avoiding getting hit by on coming traffic. We also replaced the water pump, the belt tensioner, and it had ac coils clogged. Paint also started chipping in some areas.