Is this a good idea? Reason I ask is because I have an almost new (less than 50 hours) ZTR and it keeps backfiring when I shut it down...even if I let it run idle while I clean up and double check everything. Talked to my local dealer/service provider...and the guy running the show over there told me shut it down at full throttle? Sounded weird but thought I'd give it a try. My question is....is this the right way to shut your mower down. Obviously the PTO switch has been turned to off but still....full throttle?