Took the valver nova for a test drive today, and had the following problems:
Lumpy idle, going anywhere from about 600 to 1300 rpm, this could be the icv, have not cleaned it yet;
Misfiring/hesitating from 1000 to 2000 rpm, and above 4000 rpm on full throtle. If I accelerate gently, it'll rev normally up to the limiter.
The engine has a KN cone filter, powercap, no ECU codes, new fuel filter, new plugs. Was running fine until a few days ago, when it ran out of fuel. Also, the exhaust center box is on the rotten side, could this have any effect?