125-200cc CR150 strange idle problem

The bike idles ok when it's on the stand, then once I pick it up straight, it dies almost immediately.

I only noticed this happening occasionally after I did a little carb tuning a few weeks ago. Then today, after a little more tuning, it wouldn't idle at all. It was probably crazy rich on the bottom, but when I returned it back to the original settings of 35P and stock needle, I had to adjust the idle screw up. Now after a ride, it idles high (like it should after the adjustment), but still dies when picked up vertical off the stand. If held straight, and revved, it idles down fine. I've never seen this before.

Did u check the float level?

I did. I pulled the carb apart and went through everything to make sure I didn't have a senior moment
Everything looks ok. I readjusted the idle, and it seems to be idling alright now. Race today. We'll see what happens.

Well it seems like it's back to normal now and I got a second in today's hare scramble.

Thanks for all your help, everybody.

Congrats!