Adjusting engine/throttle seetings
First as far as the idle goes. It should be set so that the car just barely creeps forward when the throttle servo is at "zero". Secondly as far as the stalling it sounds like you just need to tweak the low speed needle on the carb. Look through the instructions that came with your truck on exactly how to do this, basically you want to move the needle in 1/8 turn increments til you like the response on the low end. From what you've said it sounds like you could be a little lean, so turning it counterclockwise would richen things up for you.