I use flightworks 200 pump on jj1400 and propane to start at lowest setting. I use no gas solenoid or onboard gas. I have a checkvale in gas line. I manualy turn off gas at 29-30,000. You my have a fuel leak under your front cover or perhap an internal leak as 100 seem a high number at idle. diferent pumps, injector needle sizes,fuel filters will change these .
"Cycle","Page","Aux","Temp","RPM","Throttle","Pump ",#2008-09-17 18:30:24#
91,220,0,556,45000,257,66 idle
91,228,0,636,161000,996,332 full
You are better to use power max or a butane to start as it wilkl start slower and warm more even and your pump will not overshoot idle as much.