I have a 1987 toyota corolla FX car, front wheel drive,  my car just installed four struts 2 weeks ago( my machanic school teacher help me put them on), my car is MACPHERSON STRUT, THE coil spring around strut. After that I took the car to PEP BOY auto shop aligment.  After aligment I feel the front end of the car runs pretty good, very quiet and.  But the real of the car bounce on the free-way.  Do you tink is the strut cause it bounce?   When I push the car real bumper to test the car, it is very stiff, much stiffer than before.  No bounce after I poush the real bumper few time and took the hand off.  But on the free way it bounce( real of the car).  In the case is the strut no much the coil spring?  or the wrong strut the PEP BOY auto shop sold to my car?  Or my car has a weak spring?