Injectors

[bsummit]

I think I may have some injectors fouling out. Can someone tell me the signs and symptoms of bad injectors. At a steady throddle on level road it acts like it's not getting the fuel it needs on all cylinders. When I accelerate it will pick up and go on like nothing is wrong. When I tow my 5th wheel it runs perfectly and will run like that for a few days and then it starts running bad again. I have a good fuel pressure and it don't throw any codes.