I was wondering if someone here could give me some pointers. I've got an Iwata HP-C airbrush. Its dual action. I haven't used it in awhile. Decided to do some work with it. Took it apart, and made sure everything was clean. So I poured the paint in, and when I try to spray it, the bubbles kept coming up into the cup. I also noticed, the spray flow, stutters. Like it won't be a continuous flow. It stops for a bit, depending on how much air is going through. Any ideas what the problem might be? Before I last used it, I had to put a new fluid nozzle in. And today, I replaced the needle with a new one I had kicking around.