here's a somewhat related question : What does it mean when you go full throttle and the engine sort of stalls at the start... after that it's fine, but from full stop or slow moving to full, it bogs down on me... I also noticed that after a month or so, the settings (lean, rich, idle) have changed, without me touching it. could this be possible for the engine to need a new tuning even without touching the settings or installing hop ups?