Cobalt293

I have 2 350 mag mpi wich has been working great, suddenly one of them started working... the fuel pumps runs fine and it cranks but it just wonīt start. When I took of plug wire from coil at distributor and held it about 1/2 inch from distributor, the engine now starts right away. What could it be... i have been changing fuel pumps but havenīt touch anything else... might have pulled som cabls..

I have changed the rotor, knock sensor... but it wonīt start

I got the MEFI 3 controller.

I got a feeling that itīs a very simple fault..

Please help!