hello all im new to petrol rc cars i bought my marder about 1 week ago its been running fine until today, now when i pull trigger to full throttle the car was fludding itself i played with th screws on the carb (blindly) and now it wont start at all. and is it suposed to run on choke all the time as when i push it down it cuts out or is this wright. is their a setup manual availible?