I Put Afr 165cc Street Heads On My Car This Past Winter...guess What ...it Idled Low And When I Came To A Stop It Stalled...so I Checked Everything On This List...it Was A No Win Situation , And I Was Mad !!! I Put A Idle Adjuster Plate Between The Throttle Body And Iac And Guess What ...with A Few Turns Out And 1 Turn Back In....idles Like A Charm And No More Stalling...thanks Stangnet Members..