Hi All. I recently did an LS swap into my 98 ek. Everything was working fine for about a week but now I seem to be having an electrical issue. After the car warms up there are sudden drops in power causing an irregular idle until it stalls. When driving, because of the power turning on and off at random intervals, the car is extremely jolty. The relay in (or next to?) the ecu clicks everytime there is a loss of power. I've checked and cleaned all the connections in the harness, changed the cap, rotor and coil, but the problem still persists. A couple days before this problem arose, I installed one O2 sensor on the head pipe but the second one on the cat is still disconnected from the harnes (the CEL is on but that was expected.) Could the O2 sensor in the head pipe cause a problem like this if the connection to the harness is bad or the O2 sensor is faulty? Any other ideas of what to check next?