Finally got round to doing lol Found some info about the coating here: https://www.evolutionm.net/forums/evo-engine-turbo-drivetrain/438430-ported-throttle-body-plate-sealant-2.html This is what is left of “goop” on the back of the throttle body which my initial “cleaning” missed. Looks like it was brushed on. Similar moly paste is £60 a tin, so I went with the spray on moly dry lube by CRC which ended up being quite a thin layer despite a few coats Masked up Sprayed on front and back, I opened the valve to spray on the circumference of it too Cured for three hours and then lightly buffed Reconnected the battery, and did the relearn procedure as before. Results: the Rev hang has gone when shifting gears so I’m happy. But I still feel like the engine braking isn’t immediate when I let off the throttle, it very smoothly transitions to engine braking - I don’t know if that’s normal so I might have to book a test drive of another 86 [emoji1787] I could be used to my KTM single cylinder strong ass engine braking tho lol Lesson 1: don’t clean your throttle body with carb cleaner. I think there’s actually a couple of brands who make proper throttle body cleaning spray which don’t remove the molybdenum coating. I reckon a quick wipe with a dry rag would’ve removed the tiny bit of dirt that had accumulated at the bottom of the valve. And that’s lesson 2: don’t go straight for the big guns when cleaning, use the least aggressive method first [emoji1787]