well i finished my 4.3 swap use a 700-r4 for a tranny and it's beein great when i had the propane set up they told me it was a set and forget system but lately ive beein having nothing but troubles one weekend the truck runs great and the next weekend it wont idle or there is no power

ive beein playing with the idle and fuel mixture screw and it fixes the problem for the time beeing

just wanted to know is there a rule of thumb for a set up for propane? or is it just guess and test? when the truck is running good should i locktite the set screws?