Hi, I have a 97 3500 4x4 stick and the fuel shutoff solenoid has "issues". The rod that comes off the linkage that goes into the bottom of the piston occasionally comes out which means either it does not start or shut off. I called and Cummins wants $300+ for a replacement. Can they be repaired or is it a toss and replace? I've adjusted it per directions found here (thank you Joe!!). Any hints please.