That is a common problem on our cars. I fixed mine by setting the tune to a higher idle rpm. Think I set it to 700-750.
-SOLDfirstname.lastname@example.org RaceRed 2013 v6 Mustang, 3.73 gears, MPT 91Race Tune, Axle-Back Straight Pipe, Tower Brace, BMR LCA's, BBK Shorty Headers, BMR Relocation Brackets, Lethal Performance X-Pipe Catless.
-2008 Civic SI...