I have a 09 700 grizzly that has just recently started to have throttle issues! It sticks in forward only and only when throttling like when trying to come out of a bad mud hole! But it will do it when trail riding also! I’ve checked the spring boxes on throttle cable top and bottom both are very clean and seem to be working properly! I have cleaned and lubricated fuel injection thinking that could be the problem! Is there a sensor that may be going bad! Any help is appreciated!