What size is brass tube or called jet needle. When I put my tm38 on my 250. It done same thing. I went from a q8 to a r2 fixed it right up. Drop.needle to richest setting and see if it helps some. It help mine but was still a little lean.If it still does it you need to change brass tube out for a richer one.

Ill have to check but I think that its something other than just strictly jets. With that 88' slide in it, it runs a lot like when the motor had an air leak. Erratically and inconsistently. When I put the 87' slide in (which I know now is not a great idea) it ran normal just super crazy rich. That's why I think its a slide wear issue potentially. I may be wrong though so I'm open to all suggestions obviously lol.