BRIGGS & STRATTON Intek V-Twin OHV lawn tractor missing?

IN the gas tank there is a small screen that maybe plugged .Remove the gas line from the fuel filter hold it up so the gas does not come out and blow air into it to clear the screen of debris. You might try that just had the same thing happen on pops mover. Runs perfect now under full power. Make sure the spark plugs are fully seated and snug. You get a miss if they are loose.