Hi I am having an issue with I believe my timing after installing Texas Speed Catless heads with 3" connection pipes. I think I am getting a spike causing me to run lean at idle, this in turn is making it where if I put my foot in it I get some knocking. Does anyone have a base file for this I can review. Do I need to advance the timing?
2018 Mustang GT with Texas Speed 1-7/8"x3" catless headers with 3"x4" catback exhaust, and Corsa air intake.