Engine Mechanical problem
1993 Toyota Lexon 6 cyl Two Wheel Drive Automatic

Hi
We have an 93 toyota lexen the other day it just stoped out of the blue. We had the NRMA come and look at it but they couldn't work it out. The said there was no injector pluse. He thought it might have been the computer but we have had the computer checked and it's all good we have just replaced the crank angle sensor. Is there anyway to check the modgel on the coil pack if so how? we really have no idea what wrong we are just guessing if you have any other ideas that might help that would be great as I only rego'd it last week.
Thanks