i rebulit my engine a wile ago and my car is only runing on 3 cylinders and i did every thing i could to find out what was wrong and i still dont know why it is not working

i have replaced the spark plugs and wires, replaced the distributor 2 times, and changed all the injectors and used a noid light to see if they were working and they were fine. i got a new ecu too. i checked the compression and it is all good so i dont know what to do. i have spark , compression, and fule so what could be wrong?

plz help with any ideas

 

sounds like u did pretty much everything u could do man. not trying to insult u or anything like that but r u 100% sure it is only running on 3 cylinders? how did u find out about the problem?