Yup, plugs for capping off drilling holes. If you've got corrosion on outside of plug where access is clear, you can be sure that there's even more crud built up inside of corners on other side of plug in actual fuel-circuits.
Analogy I use is garden-hose and sprayer-nozzle. People are always focused exclusively on cleaning/replacing jets (sprayer-nozzle). But they never clean 20-ft garden hose. If you've got 12 golf-balls stuck inside garden-hose, no amount of cleaning jets is going to help get flow going.
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