I really need some help with my 2016 ram 1500 eco. Keep getting this code p0087 seems my local dealership can't tell me what causes it or don't want to. Started out change fuel filter, did that, no help, next change tank lift pump did that , no help now we are at fuel rail pressure sensor or fuel regulator or a bad injector seems that my truck has turned into a cash cow for them. thanks in advance for any advice .