short discontinuations at 2000 prm

[gmaragos]

hello
i have a problem with my alfa 33 that i can not solve it yet. First my car is a alfa 33 with boxer engine katalystic and injection. When i rise to 2000 prm i have short discontinuations that stops after 2500 prm and above. i have tried to clean the becks, change
spark and the wires, but nothing happens.please if anyone knows h e l p..........
thank you
george

[alfistagj]

try disconnecting the wire on the (what we call) lambda sonde at the cat.
When defective and connected, the ECU measures a defect and starts messing up. When disconnected the ECU measures nothing and just doesn't do anything.
The Lambda sonde measures the exhaust gas composition (CO) and regulates the fuel/air mix to get a "clean" exhaust.