i was told by my LHS that i should use a receiver pack rather then batteries. he said the pack wold be stronger then regular batteries. i can see when i turn the gst the stearing dont really turn that much is it because its idel? also when it was running i noticed the trasmission gears moving is that normal and when it gets low on gas it would jump from netrual to full throtle is that normal also? thanks for your help guys.