why have you fitted bigger injectors? what mods have you got?
my t.c light comes on/stays on when there is a fault,
my code reader resets the code and turning the engine off/removing the key then restarting the engine clears the tc light.
no idea why........... it just works like that!
your throttle plate might be sticking open, pop the inlet pipe off and have a look, carb cleaner will remove the oily s#ite!