I need some help on this. It may be nothing but looking for advice. I just got back for vacation pulling a 8000 lb camper(bumper pull) From savannah,ga to severville,tn. On the way up I was in my light tow tune +60 horse and going up a hill long pull egg went to 1300 and it popped a cel. When I looked at it it was the p0087. I then turned the tune down to +30 tow tune. On the way home same thing got would run high and then pop cel. I have installed Kennedy twins, new fuel filter, racor. The onlything I have not changed is the fuel lines from the filter head to the pump. The truck has never ran that much get pulling the same camper.