Car "bucks" under hard acceleration

[Jason]

I put in some injector cleaner, I have yet to change the fuel filter, any other suggestions? Coil? if so how? any ideas would appreciated. thanks in advance
BTW its a 1990 535i 5spd 90k

[Patrick]

You answered your own question -I'd replace the fuel filter first, then maybe fuel pressure regulator, and see if there's any improvement.