i just baught a mazda mx3 1.6dohc when it idles it runs perfect no skipps but as soon as u chuck a rev or try to bring the rpms up its breaks up skipps like its no ones buisness.. ive already changed cap router plugs and wires and throttle body sensor and mass air flow... anyone kno wat else it could be...

Another Question i have another mazda mx3 same year and motor size runs perfect no skipps but when it sitts and it start it blows black smoke like its burning oil i was wonderin if its the valve seals becuase it smokes for like a min or 2 then stops

 

Black smoke is usually unburned fuel (running rich.) Blue smoke= oil.
If the car has a 5th (cold start) injector, there may be something wrong with that system?
As far as the other car...? If it does this at higher RPMs, say around/above 4k, you may have a clogged cat? Or it might be a bad coil pack? But these are just a guesses.