thank you all for your help i have found that the last so called machanic had put all the wires in the wrong place now have the problem of finding a wiring diagram that covers the oil injection module and the idle adjust module. it will now run on 3 cyl but tests are showing that the stator and one of the switch boxes have gone also the ignition switch dosn't switch off the engine. so if anyone knows were i can download a detailed wiring diagramme for this mercury 135 black max s/n 0c248876 1990 i think, it would be much appreciated