I had same problem.
Check you have continuity between terminal 2 of the ignition control module plug and earth. If not, it's a bad earth.
Mine was on the back of the radiator on the left hand side looking at the car. I clipped it to the main earth between batt and gearbox and that sorted it. Basically, the earth connection on the radiator was sh!t.
There could be loads of things I've learnt- but that was the issue with mine and a quick check/fix.