Hi everyone, while driving my 1990 r32 GT-R last night, an unusual rhythmic chuffing noise from the passenger side of the engine bay started occuring as it started to come into boost at highway speeds on a slight uphill. Power was down, felt flat and lifeless. It did this a few months ago as well and i thought it was the blow off valves leaking, so i replaced them with a greedy one mounted in the factory location. The unusal thing is though if you stop the car and restart it the problem is gone and drives ok... tried turning the key off and on whist driving didnt stop the problem, it has to come to a complete stop.. Car is stock save for trust exhaust and bar and plate cooler, boost at 1 bar. Any ideas?? Spark plugs have bee changed, compression checked, injectors flowed and tested, no ecu codes have been set.