okay details are: 88 gta, 305 TPI, 5 speed. 130,000 kms. new plugs, wires, cap, rotor, fuel filter and knn air filter. fresh oil change. I just did a iat relocate and it improved slightly, but still buring waay too rich. Anyone a TPI expert and can help?

no service engine light comes on, engine does not miss or have any irratic idle.

just one question.....if the cat is clogged... can that be a huge cause of running too rich?

thanks.

 

I don't think the cat being clogged will make it run rich, but it will make it a dog due to increased backpressure.

Running too rich will kill the cat, though.