mazda87

my 87 has a 88 atkins rotary build all emissions removed. idles fine and drives but starts breaking up at 2500. spits,sputters and acts like it is bouncing off the limiter. ne help please tryed everything but new injectors and ecu

RX7 13B 4 UR AZZ

you should have your primary injectors checked and cleaned. Try swapping the secondaries to the primaries see if it is better. If that's the case then you should start to see problems after 3500. I used RC engineering to go through my injectors and they came back beautiful.