fault code

niklock1

New Member
i dont know if anyone can help but ive got a norris designe engine with a dta e48 ignition system, the car is running really juicy but the problem i am having is it dosnt idle properly it goes from 800rpm down to 400rpm hot and cold. it is very hesitant when cold and if floored it sort of miss fires ive done a fault code check and it seems to be coming up with 21 two long and one short,has anyone got any advice what i should do without taking her to a garage please . :?
 
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