Ok so my 2007 b2630 tractor is stalling at full pedal depression only. I can push a block wall till the wheels spin,It will throttle up to 3gs and idle just fine,checked Pto switch, and the seat switches, Have replaced the HST switch, have moved it so plunger is set in neutral but tractor will still role just slightly. Can move forward at half throttle, but you mash on it it dies.Any info would be much appreciated. Thanks.