I have a 2012 shelby gt500 full build engine with 4.2lc supercharger and a 168mm KB throttle body. I already have a tune for it but i have an issue when quick shifting or wot shifting the throttle stops responding and sometimes car shotdown. This issue only happens on the race fuel tune , on pump gas tune it doesn't . So am sure it is not a throttle body issue but a tune issue. Tuner is not accepting this fact or can't acually solve the issue. Any one had a similar issue or knows a tuner that could solve this problem ?