Ryan, This could be caused by several things. "Typically" with a bad fuel pump, clogged lines or filter, you wouldn't get up to higher RPM's (at least not smoothly) because it'd be starving the enging. I'd be more willing to say it's in the carb or ignition (timing, vacuum advance, or plugs). Also, vacuum lines and emmisions equipment is a likely suspect. IMO a carb kit should be regular maintenance every few years on older vehicles. When in doubt, it's hard to go wrong with a full tuneup...

Like everyone else told me, you most likely have a hole/crack in your vacum lines.  Best way to tell is to open the hood, and spay some starting fluid towards the hoses.  IF the engine revs, you have a crack.  This is dangerous and probably not how the mazda dealership would fix it, but it's a lot faster!

I have the same truck, same problem. my mechanic told me the U Joint was shitty on the model and needed replaced. starts and stops because it is worn out in certain spots and the truck jumps when it hits the spot, and lunges. usually happens in 1st and 2nd gear, smoothing out in 3rd. fucking piece of shite, not worth replacing, just buy a new truck.

If anyone would like to sell one of these poor running B2000's let me know. If you'd like to know what is really wrong let me know also. (618) 531-7799. ImDrunkOrUrCute@sbcglobal.net. Thanks, Chris

Ryan, Interested in selling this vehicle? Imdrunkorurcute@sbcglobal.net I can also give you the root source of the problem. I've had 4 of these trucks. Had the same problem with ALL four.