i was wondering if i could adjust my throttle servo so that when i open full throttle the slide opens completely on the carburetor? is it ok to do as i have noticed it doesn't open all the way normally.

Yes, it's supposed to be open all the way when the trigger is pulledall the way. Just make sure that it closes to where it's supposed to bethen you let go of the trigger

i have another problem. sometimes when i am driving i will hit full throttle and the car wont respond, i hear a slight engine rise but the car doesnt move any faster. when i am holding it full throttle when it does that it drives like i am pressing 1/4 throttle.