strange fault this one. weird how its only at 3Krpm. reminds me of my Evo, fitted new spark plugs, gap was too big, as soon as you come on boost, the boost blew the spark out causing a miss. but obviously theres no boost to blow out the spark on these
could it not be spark plugs/coils breaking down as the engine gets loaded up? especially if its only a splutter? surely if it was the MAF, it would be jerking around all over the place and not just a miss at 3k as it can control the airflow?
get under it and check your lambda sensor wires if it looks like theyve been rubbing. and remove your sims from the decats. i fitted the sims from zmanalex to my japspeed decats, then lowered the car, had a random look under the car to see how low the exhaust was and noticed the 02 sensors were really low. going to remove them on my days off, so im using the derv at the mo.