Im going to skip to the point, the car will misfire when idling, under hard acceleration (reving it up in the driveway) It cuts in and out (the misfire) Constantly. I have run out of ideas please try and help me out. Im at a loss. Oh and even knowing there is clearly a misfire there is no check engine light flashing or illuminated. Yes it does work, unplug random sensor light pops on.

Car: 2000 Honda Civic Si
Engine: OBD2 JDM GSR approx. 70k miles on it
ECU: OBD2 JDM & USDM (Running USDM right now) (Also, problems doesnt change with swapping out ecu at all)
Additional info: have performed the "CKF Trick" still installed

Tests Performed: Timing is on, Compression is good, Vacuum test passed, resistance check in ignition wires is good
Parts Replaced within 1-2 years: Spark Plugs, Wires, Cap, Rotor, Fuel Filter
Parts Recently installed: New Distributor, Spark Plugs, Fuel Pump, Cat Deleted test pipe installed to stop cat from getting destroyed (misfires were causing cat to spike in tempeture and glow red)

So if anyone you know has an idea, please, please help me out.

 

what plugs do you have in there?

 

NGK Vpower

 

Have you determined yet if the misfire is due to no spark or no fuel?
If not, you will need to. 94

 

im not sure he has. do u think its possible it could be a bad ground?

 

I would recheck those spark plug wires. Using a pair of insulated pliers you can pull each spark plug wire individually while the engine is idling. You want to look for the spark jumping through the boot and to ground. Just kind of move it around in the tube to get all sides as close to ground as possible. A resistance check might not catch that. The most common cause of misfire on these cars is secondary ignition parts (Wires, cap, rotor, plugs). The misfire detectors in that era cars were not usually very sensitive so it may not set a code.

 

Ditto the above^^^, also make sure the spark plug tubes are clean and bone dry.

I would also check to see if misfire is random or cylinder specific, pull the spark plug leads one at a time, unplug the injectors one at a time. 94