Sort of like the last 2 posts combined, plus a few more factors...
EBPS, EBPV, EVPR and IAT are all tied into the EBP system. So if the IAT senses less than 40*F, it trips an EBP system cycle. When in that cycle, the EBPS sense back pressure , adjusts the injectors against that cylcles fuel tables and sense excessive back pressure. The EBPR pulls the EBPV closed except when under a high load or high rpm.
I don't have an EBPV or EBPR, have an EBPR delete fooler plug, but kept the EBPS and I keep the tube clean.
Yes, usually tens of thousands of miles between cleanings... Unless maybe you are running too rich and clogging it with suet? Maybe a tuner contact for adjustment of your tunes?