Just for future reference. Might help you or may not. If you have a manual for the tractor, visit the maintenance section. The manual will show you where the air filter is located and how to clean or replace it. Periodic maintenance or cleaning is a regular process to keep the tractor running. Might need cleaning every 50 hours or more so if using the tractor for field work (dust). Also grease all the joints (zerks) shown in the manual about every 10 hours is common.
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Well, sorry to waste your time with a long post. I am glad you got it shut off and hope you can get the problem corrected soon. Best wishes, welcome to TBN.