hi im new here have a 2008 2500hd duramax and installed a pmt bully dog truck was running fine until i install a 53 gallon fuel tank at 400 miles the change fuel fiter info came on and then low power on engine bully dog diagnostic says p0087 changed the filter cleared the code and got the service engine light out and truck seemed fine until 100 miles down the road it did it again this time i cleared the code and the engine picked back up but it keeps doing the same thing, i have read some info on the net about this code and was wandering if anyone out here has any ideas. rich