I just had a blown H22A4 swapped out for a H22A. My tech was able to keep the car OBD2. The only problem is after driving for a while the car stops idling. Someone in the Prelude forum said that it could be the map sensor, so I ordered one today but now he is saying that it did not fix the problem. The intake system has alot of build up so I am going to clean it up the EGR Valve, throttle body, and anywhere that may need to be cleaned with carb cleaner and replace the distributor and rotor. Plugs and wires were replaced yesterday and it continued to have the problem.