My Major Engine Trouble

[Duchie]

I have a 1993 R33 GTS and i hadn't drivin it in about a month and i began hearing a strange ticking and knocking noise from the top of the engine. After some research and a drive i believed it was the injectors seeing as the car would loose power at 4500+. So i took the fuel rail out and had the injectors cleaned, while it was off i cleaned the plenum, which was time consuming to take off and put back on. After this i started the car and it seemed even worse, it almost died on idol and wouldn't go past about 2500, holding it at 2500 the revs would also fluctuate. So i replaced the fuel filter, O2 sensor(always smealt rich), resoldered the AFM, ran ECU diagnostics with no errors, checked all the coils for problems, cleaned them up (already sealed with silicone after previous missfiring on idol) and put in new plugs. After all this it still ran as rough as guts and i was frustrated, it seemed better but still had a weird noise. I was thought it may have been internal but decided to rev it a bit and let it run for a while and what dya know? Its better now. Thought i would just share my strange experience which cause me a bit of stress for a few days.

[V28VX37]

Sounds strange. Just a guess - have you checked your Crank Angle Sensor? Took me a long time to identify that as the cause for my misfire issue.