2002 LRV RFI issue, please help!

bought it last year. Figured out it had a bad fuel pump. I replaced the fuel pump and filter and it ran great. A month ago, it was running great and then I could not get it past 3500 RPMS. The MAG spark plug has a good burn, the PTO is constantly fouled. The spark on both is good when testing. The fuel pressure is good, compression is good. No error codes. Could it be an electrical issue where as you lose spark after it starts up? I did replace the voltage regulator as well. Any help would be appreciated!!
 
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