My Nissan Primastar wiring fault warning light comes on intermitantly when I'm driving around and the power drops off into limp mode. Also when I accelerate there seems no power untill all of a sudden it jumps in. I had a problem some time ago with a chaffed wire which gave the same problem, but didn't watch the mechanic to see where the wiring loom was. Can anybody help?

Kieron, July 2012