I haven't heard of any LMM needing to do it but yes if you are requesting a lot of fuel like on level 6 you FPRV will let feul back into the take thus setting the 1093. After it does it and resets however you should have the same power until you request big fuel again. Shimming the valve isan't that bad but can be a pain to get the Glow plug control moduel braket out of the way in order to get to the fuel valve. Here is a link to the install: http://www.pacificp.com/pdf/manuals/ShimKit.pdf That is for the LLY/LBZ, but i have been told that it is the same for the LMM.
__________________ KYLE 
05 Chevy LLY Crew Cab LT Dually 4x4, Crank it up Diesel Tie rod sleeves and centerlink, BD Diesel Remote Fuel Filter, EGR Blocked, TTS Dual Lift Pumps, FPRV Shim, Bullydog Outlook Monitor, AFE Stage 2 CAI and modded turbo mouthpiece, BD Diesel Manifold, Diamond Eye Turbo Direct Pipe, Diamond Eye 5" exhaust straight piped, Level Kit, Suncoast Stage IV w/ 1056 Torque Converter and Allison Deep pan EFI Live Tuned by IdahoRob!!!!
1981 VW Rabbit Pickup, 1.6L Diesel, 4 Speed Manual, 35 MPGs |