why is my chev.prisim fill every bump in the road until I get it up to 50mph

What is your question?

I have put on stabilizer links and lower control arms on the front and I have good shocks on the back. and good struts on the front?

What makes this problem better or worse?

its great after it exceeds 50 mph

How long has your 1998 Chevrolet Prizm had this problem?

2 months