Also today on my way home I was stopped to pull into my street and when I got on the gas to pull up my road it was slipping but when I let off the gas it work fine again.
When it slips shifting from 2nd to 3rd I'd definitely be looking at the throttle pressure adjustment. But if it's throttle pressure it would/should be accompanied by very early shift points. When it slips on take off from a dead stop, I'd definitely rule out throttle pressure adjustment. But then again you could have more than one problem.