hi my m20 engine has a few start up and idle issues. one is at start up it takes a few seconds until it starts, and also when idling sometimes the engine fluxuates in rpm between 750 and 400 and it shakes the car. Recently i just did a tune up new plugs wires cap and rotor, and i have drove 7k miles so far and never replaced the fuel filter, So my question is what do i need to do? replace the fuel filter? or the pump? or is it much more simpler.


justin


90 525i m20 w/106k