A few symptoms physically along with these dash issues. Only when at a high rate of

speed

 

Need more info, year, engine etc., thanks.

 

2005 Ford Five Hundred Limited FWD 3.0 DOHC Duratec Engine. Sorry about that! 😅🫡

 

Can we get the fuel trim and oxygen sensor numbers?

 

Shrtft starts to go way up on uphill and begins shuddering and front fires multiple times like it's cooking, even when fuel is three quarters full. Turns out I may have found the reason though. Flashed 06 instead of 05 when I have been doing upgrades on it and simultaneously arguing with the missus. Pretty sure a cat difference in the 05 v 06 strategies