Ok so about a month ago I bought a 2004 Comp G with 84k miles from a guy who put a lot into it. About 2 weeks in though I notice that it's thumping a little when it upshifts and come to find out it's skipping third. I know I'm an idiot because I didn't check the fluid when I bought it, it slipped my mind and turns out it was burnt. I have to keep telling myself what's done is done

Anyway it just suddenly happened, no problems leading up to it or anything. I decided to try a transgo shift kit since I'd seen it help someone, and while in there I found the 2-3 accumulator piston seal was torn and not working at all so I put in a new one and filled it up dex 6. Shifts better and doesn't thump between 2nd and 4th anymore. But still no 3rd From what I'm reading a bad clutch should've shown some slipping before it went out, and shouldn't bad solenoids usually affect more than one gear? When I downshift from 4th to 3rd for a split second it feels like it's going to third but then I'm pretty sure it's in second and had to rev match, cuz it would hop up to 4000~ rpm at 40mph. I get no codes, it basically just kinda acts like 3 doesn't exist. Could this be an issue with the PCM, or maybe can a solenoid only affect one gear? I just think if it was a bad clutch it'd have been slipping and would still be having issues, not just shifting like usual minus 3rd one day.