Is it a manual car? If so, the reason the afr is lean on decel is you're off the accelerator, the tps shows the engine is at idle and therefore it only receives idle fuel amounts, even though the rpm isn't at idle. If it's an auto and the engine isn't at idle on decel that could be the reason as well. A carburetor won't fix that issue. If the afr is at 9:1, that's pig rich and needs to be fixed immediately. Have you checked the plugs to see if they're fuel fouled?
