ok to the first one.. the books information is wrong
the needles should be hs 2.5 -3 and the low should be roughly 2 or less
its stalling because the low side is rich as he77 turn it in gently back it out 1.5 turns and try .. keep an eye on your temps tho

for the last post you have something metal pinging against the motor or exhaust causing it to freak out.. it happened to me
when i first built the roll cage for my evader st the metal cage was vibrating against the muffler and causeing massive radio
interference.. otherwise you may have a bunk servo internal board on the throttle that can cause irratic actions
start by checking for metal to metal contact making vibrations thatd be my guess then find a spare servo
and change that one if it persists then change the reciever .. its all it could be.."as far as a radio problem"