120MHz BPF
Davicente,
Try to include in the simulation tolerances of the elements.
Your filter is relative narrowband and probably sensitive to tolerances.
I dont know how your filters looks, but in your case, it is better to use a filter with resonators instead of canonical form one - you can design such a fiter with identical inductors. Take a look at N/u/h/e/r/t/z web site. There you can find F_I_L_T_E_R Solution 9.0 demo, capable of designing of filters with identical resonators.
Best of luck,
STO