Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
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It is possible the issue here is with the catalytic converter itself.If it is restricting internally or broken up internally it may be restricting intermittently with the broken pieces bouncing around plugging off the flow and cause the smell and the chugging feel here.If you have not had this inspected to see if it is the cause here this needs done.If found to be at fault it will need replaced.
The other issue is a cylinder misfire with one or more cylinders misfiring causing this fault.This can be due to a faulty ignition coil or spark plug or even a fuel injector acting up.This would have to be checked into further to locate and repair the fault here.Both engine misfire components and the catalytic converter need checked into to see if the fault can be pinpointed.
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