1992 Jaguar XJ6 92 Jag won't start

I recently had to replace the fuel pump, and the fuel filter. After reparing the fuel delivery issues I tested for spark. I had an orange spark (I've never seen this before, ) and noticed that the plugs were rather worn so I replaced the plugs, wires, cap, and rotor. I also took the ignition coil in for testing at an autozone and it checked out.

I had the car on the road for about two weeks and then I started to run into trouble again. One night the car would not fire after it had been sitting for almost 11 hours. I tried several times and finally I reset the inertia switch and it fired right up ( not sure if this is coincidence or not.) A week later the car would not start again. This time it sat for two days. Today I went to see if it would start and it did. I started it and shut it off about 4 times (changing the oil) and when I went to start it up again, nothing. It cranks strong, and when it did run the tach reading held steady.

My friend who works on alot of cars believes that it is the ignition control module. Can anyone help me out with an opinion?