Offhand, it sounds like a dripping injector or two. But k-jet is all so much guessing without either using a pressure gauge or sticking the injectors in some empty water bottles and testing.

The AAV or "air slide" didn't make it to the B21FT. I recommended same to someone (asked by email) a week or so ago, and when he asked me "where it was" it dawned on me I was thinking of my B21F car, where it mounts to the cam cover right up top. The function of it was replaced by another CIS, (Constant Idle System) an electronic idle speed feedback controller, introduced in '81 and used with all the B21FT motors.
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Art Benstein near Baltimore

A man and his ever-nagging wife went on vacation in Jerusalem . While they were there, the wife passed away. The undertaker told the husband, "You can have her buried here in the Holy Land for $150 or we can have her shipped back home for $5000. The husband thought about it and told the undertaker he would have her shipped back home. The undertaker asked him, "why would you spend $5000 to have her shipped home when you could have a beautiful burial here, and it would only cost $150????" The husband replied, "Long ago, a man died here, was buried here, and three days later, rose from the dead. I Just can't take that chance".