I have a year old savage xl the motor started acting up lately. It was dieing when i excelerated hard past 3/4 throttle and starting began to be difficult. i bought new fuel did not help. was getting fuel out of the high speed needle so put a new carb on it now truck will not start turned idle screw half turn up tried everything. engine seems to have compresssion.

help dont know what to look at could piston be shot or cylinder?