so my truck,after 9. 7 years[thanks to fass put in 6 or 7 years ago. ] was perfect,normal south bend clutch replacement ect,then died. tow then dealer 100. 00 to read the code and towed back home. now its sitting in the front yard with a p1688 code. I ordered a new vp44 from midwest fuel inj for 1018. 00. Now i have a few questions on the install. do lines need flushing?do i need to get a overflow valve,pul injectors and clean,ect. any help i appreciate. Man the letdown of this dependability of this thing is just heartbreaking. thanks