I have a 1985 CRX Si, #40 Jackson cam, aftermarket O2 sensor, matched injectors, tri-Y header, no cat. Out of the blue it started to stumble under heavy acceleration. It got progressively worse as I drove, plugs were fouling. I have replaced the cap, rotor, plugs, coil, distributor, wires, fuel pressure (aftermarket pump) is at spec measured with a Honda gauge. No codes in the ECU.
This is something that happened years after all the mods were put it place.
Suggestions? Comments? Thoughts?