360 stroked to 408. Running issues.

RammerJammer75 said
Is it rich or lean on the air/fuel ratio? Does it shake badly cold, warm, or both? Have you made sure the grounds are good, verified there are not bald wires that could be grounding and that the connections are good and tight? Just a few questions that could help us answer your questions.

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.

RammerJammer75 said
Is it rich or lean on the air/fuel ratio? Does it shake badly cold, warm, or both? Have you made sure the grounds are good, verified there are not bald wires that could be grounding and that the connections are good and tight? Just a few questions that could help us answer your questions.

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.