anyone have problems with RIPP's bypass valve?

I've had a RIPPed GT since November 07, and I'm still learnin alot about it. I just fixed a fuel delivery problem, which was easier and less stressful than I thought. I took the car for a little test drive to see how it was running. When I get to about 3500 RPMs, the car stammers and stutters until almost 5000 RPMs. If I let off the pedal, then floor it again, it fixes the problem, but if I just let it ride from 3500-5000 it jerks all the way through. It feels like a problem with the RIPP bypass valve. I tore the valve apart, and noticed it tends to want to get stuck in the valve housing. I tried lubricating the piece, but it only betters the problem instead of preventing it. I've had problems with the bypass valve before, and I was wondering if I should switch it out with a different aftermarket one? I've seen other people replace theirs, and I was wondering how I should go about switching, and how well it works.