Stalling p-10?

I have a p-10 that is begining to stall after it has been driven for more than 10 minutes or driven hard, if even just for a few minutes. I had my alternator tested and it is good. My car is a stick and I have a stillen intake. When the problem started a couple of months ago, I cleaned my intake and that fixed it. Now the car has started acting up again and was wondering if anyone had any ideas. The car does not do this always just like maybe 1 or 2 times a day. After it sits for a hour or so it starts and idles fine. Just wondering if it could be my oxygen sensor or if someone has had a similar problem.

I'm guessing your base idle needs adjustment. This is probably a result of cleaning the TB. It's not uncommon.