Hello all i have these two codes p0203,p0336 popping up on my 2004 3500 4x4 not all the time just here and there more there latley ..i know what the codes mean but the truck runs fine no issues even when engine light is on i am going to run some Howes injector cleaner to start with any other ideas on what might be causing this code issue truck has 95xxx miles on it Banks six gun Banks ram horn never had a problem with it but codes have been comming on a more regular basis as of now...thanks for any input on this.