I have a 89' Crx SI with B16a and it's not running correctly. It sounds like it's only running on 3 cylinders and i'm out of ideas...... I have replaced the following parts in hope that it would fix the problem: New spark plugs, Oil changed with new oil filter, Fuel injectors were taken out and cleaned, New JDM B16A distributor, emptied gas tank and filled with new fuel, intake manifold cleaned out, radiator flushed, rewired knock sensor and both Vtec plugs.... I've spend lots of cash,time and anger on this damn motor and i can't seem to figure it out... Please help me if you have any ideas.... I would ver much appriciate it.... Thank you!

 

How about the spark plug wires? Are they ok? If so, I would say get a compression test to see what's going on..

 

did you check the compession in all the cylinders?, you could have a burnt or broken valve. or something as simple as a bad injector. did you confirm that all the injectors are recieving power?