so after the last month I have changed the plugs, wire, rotor, shocks, idler arm and bracket, rear pinion seal, pumpkin gasket and oil, radiator, battery, drum shoes, and added a trailer brake controller. finally ready to do some serious driving and I get a P1870 code while pulling the pop up to the campground. we made it there but i need this thing in running shape for taking the camper to sturgis in 2 weeks please help. I just order this product off amazon a TCC valve upgrade replacement by Fitzall and also going to test the TCC PWM soleniod anything else i can do?