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Originally Posted by KSKarl  95 would be OBD I, right. That won't give you an error code for a failed cat like OBD II does. |
We had one member on this board 98 318ti with no catalytic converter efficiency error code but he was having issues like you that kept getting worst. Converter fixed it. My neighbor down the street had a Bronco with same issues, no power and got worst the longer he drove it. He decided to punch a few 1" holes in the converter and he has been fine for about 1.5 years, a little louder.
You can test for a clog by disconnecting the exhaust off the header and tie the pipe up under the car real well. Yes it will be very loud but it will run great if you have a exhaust clog. This is the only advice I have for you.
John S