I am not familiar with that model. I don't think they sold it in the US. I am not familiar with the EZL specifically either. However I am familiar with transistorized ignition control units in general. I am guessing a few sensors connect to that like cam sensors and crank sensors? Maybe knock sensors? I see a couple big connectors on it. Is it possible you have a marginal crank sensor for example? Just guessing here. Otherwise, I am guessing you are using older salvaged EZL's and it could just be that they were all near their end of life. Transistors and other parts can degrade with use in different ways, and heat and high voltage can exacerbate this process. If you get it working you could see if there is a specialist shop that is good with scope diagnostics and they could look at some of the signals into it and see if anything looks suspicious.

__________________
1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra