Originally posted by Kremithefrog:

Uh zetecs don't have precats.



Thanks. Edited for accuracy.

"Anyone know if it could be a clogged cat or how to test?"
For the Zetec.
A good cheap way to test for a blocked exhaust is to remove the upper O2 sensor, and see if the performance improves. Battery needs to be disconnected before uninstalling and installing O2 sensors. Good luck.

"Always do the cheap and easy ones first." 1996 V6 ATX 96K miles