hi guys first post all though have read about 30 pages off them over the last 2 days trying to find the answer comeing close but not quit there, whilst accelerating or crusing sometimes not even every drive just one offs, the engine will slow like cough then be fine and run great as uasual, only lasts a split second but noticable esp wen youv got ur foot down , was thinking erg valve or tb, but never happens at idle and is v smoot at idle, and wen its cold out like 10 degrees or less it neva happens, so does that rule them out ?. thanks