[jackal342]

Hey, I had this same problem with my 1997 firebird, and though the cat was clogged it was because of the misfire. The misfire was caused by a bad connection to my ignition control module.. I got a used one from ta creations for about $50. It solved my problem except for the cat, I just cut that off and went with some o2 sims. Also I should add that my ignition control module came with the coil packs. All is great now!!