I thought you changed coils and module already as stated in your first post?
Were they defective? Probably could get a refund.
Swapping parts is the best way to isolate an unknown intermitten problem.
I do it all the time with used parts.

yes we did change the igition module once. but it was with the one out of our other ponneville. but we could not get it to work. so we had to buy new. we are trying to use as much of the other bonneville as we can before we decide what to do with the rest of it. it is white but the back of the car got hit and the 2nd trans. went out. so we don't know what we are going to do with it. how do you check codes with just a paperclip?

http://www.bonnevilleclub.com/techinfo/?article=34

You could save it for parts, or part it out.