Can not figure this out i have a 421 stroker 650 lift cam trick flow heads 12 to 1 with mast intake 4500 bore and accu fab tb and have an issue with the speed density tune...at start and for 5min or so when u go to give it gas as soon as u touch the pedal it goes past 18.0 lean and trys to stall,let off, it idles.give it gas does again...this is with it rich at idle cause if I run idle leaner its worse, once running for a bit it stops doing this... dont change much when cold but its worse when hot...so if I add fuel then after it stops this issue it like 10s rich just off idle...its like I need a squart of fuel just as u touch the pedel what should I do?