Deceleration valve leaking?

AJ/FormS said

If you defeat it with the CAT still in there, Have you given a thought as to how the Cat will deal with the resulting rich-on-decel, mixture?

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I think one outweighs another: running or protecting the CAT? Hadn't thought of the consequences but what's a little heat to an old CAT or is the possible backfire a more pressing issue? I juust want this thing to friggin run again. And if i need a $30 valve off an 80 Fairmont, ill get one. The original Mazda version was >$400 5 years ago. Just had a different layout, 90 degree vs Fairmont model that is inline. Not an issue.