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We have a first generation 1995 Mark VIII that has a clogged cat. We were thinking of removing the cats and putting straight pipes. What if any problem would arise from doing this? One cat has a temp of 300 degrees and the other has a temp of 900 degrees.

I drove it around the whole day no problems. I stopped off at the auto part store for something. I got into my Mark VIII and turned it on. It started to tremble. It is getting worse. I changed the sparkplugs immediately thinking that would solve the problem. No good. I checked the coils and they...