Acceleration Problems

-95 325ic
-speed = approx 50mph
-apply further acceleration
-car drops a gear and RPM's increase (so far so good)
-BUT!!
-RPM's do not sustain, rather they fall and oscillate (high/low/high/low)
-this only happens whilst cruusing and wanting to perform short and sharp acceleration
-it is like the car can't maintain power..........

Any ideas???

Coils ? ?

My 84' started out like that, with the same problem.It got worse as time went on..Long story short, after many parts...T.P.S. sensor was getting oil in it from a bad pcv valve. Let oil get on throttle plate shaft,and drip into t.p.s. sensor. pulled sensor and cleaned..it helped..so I replaced it. problem gone.. Hope this helps. Mark

Cool, thanks! Was this a costly fix?

clean your fuel injection system,i hope that will help!