Flat spots in the power

Please is there anyone that has any ideas?

When driving along the power on my BMW seems to cut in and out as if the injectors are dirty. The car seem very flat.

I have replaced the Plugs, fuel filter, Air filter, put injector cleaner through her and still no change. The problem does come and go away and then it comes back again !

Any ideas?

Regards Dean

I have the same problem with my 1992 325i and my mechanic knows these cars inside out and he definitely says that it comes from dirty injectors but i don't want to spend any money on new injectors.....i'm looking for a way that really cleans them now.

Thanks for your reply. I will try putting some injector cleaner through. If that does not work I will purchase some new ones. It becoming more frustration the car always seems to pull back when you need the power !!

Dean