Engine Sputter

I have a 92 Mazda B2200 with auto trans and my engine is starting to sputter. It does it when it's at a dead stop and right when it's about to go into second gear the engine will die out for about half a second and start up again. It only does this with light acceleration, if I stomp on it it wont do it.

It also sputters around the 50mph mark unless I turn my overdrive on, the engine will kick back and continue normal. And around 70mph the engine will kick back a lot unless you take your foot off the gas.

I replaced the fuel filter, new plugs and wires, and sprayed the carb with a cleaner. Any idea what the problem might be?

Thanks.