No power
 

Hi all

i drive an A4 1.8t B6, the car was startering so i took it to the dealer. they said one sparkcoils is missfirering. i bought all 4 of them from goldwagen installed them myself and now the car has lost power. some times it wil just Decelerate it self. the rev counter never goes beyond 4k and the speed is limited to 140km with the padal pressed all the way down. any body who might have an idea of what could be wrong? please help.

there is no warning light on the desh. the make for the new coils is BorgWarner BERU.