360 stroked to 408. Running issues.

Jared Adamache said

Yes sir checked it all. The air fuel will be on target at idle, but when gearing down to come to a complete stop it’ll spike to like 35, then down to 7,8,9. Wiring is all sound.


All wiring is sound. it runs and idles fine. It’s when I’m starting to slow down to stop it struggles to stay running. The afr will jump to 35 and stay there for a bit and then down to like 7,8,9. Fuel system is all good as well.

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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?