mines doing the same, i replaced the ISV and its still the same, RK engineering did my timing and set the idle higher (turning the screw on your throttle body to the left) , he did it when the engine was hot so it doesnt cut out at junctions but its a b!tch to keep at idle in the morning so i sugjest doin it when its cold! the problem only developed in mine when i changed from a 40mm inlet to a 50mm, only thing i havnt done yet is change the gaskets! let me know how it goes as i have a freind who's having the same issue!