Running rough fleetwood cornado

I would pour the Seafoam directly down the throttle body until engine stalls, let it sit for 15 mins then restart it(read directions on the can). I would also check your sparkplug wires at night to see if they are sparking to ground. If problem still exist check your fuel pump pressure. The IAC can be checked and cleaned easily. Sometimes carbon builds up on the pintle. From your post it is hard to tell if it is a fuel problem or an ignition problem, but if you do these simple things first and report back you will solve the problem. Good Luck.