SO here is my problem, I had one black fouled plug in my 77' datsun 280z and it seemed as though i had a dead cylinder so i checked spark on all plugs and compression tested all cylinders and got 120 across all of them a couple were about 125. so i assumed it was my fuel injector just dumping fuel and fouling the plug sop i got 6 rebuilt injectors from BAP and installed them this morning, when i started her up she ran even worse. Now i have centralized the problem to the 3rd & 4th fuel injectors. When i take out the spark plugs on these two there is no difference and i checked the spark for both and when i take the fuel injector connector off there is also no difference in both. I used a circuit checker to check the fuel injector connection and i also tested them by using them on different injectors. So I finnaly decided to put back on an old injector onto the 4th cyl and removed the new one and i still have the same problem. I also tested the new injector that i removed to see if it was firing and it was. Now i'm stumped and need any help you guys can offer! thanks much -zane