Certainly old injectors were in poor shape .....your set went together perfectly and crtainly improved performance ..now we have pulled throttle body and cleaned a super gunked TB and idle sensoe.....will be replacing when parts arrive also putting new fuel pump and upstream o two sensor ......along with new fuel filter she should be as good as new.....whew that was alotta answer.....I think we got it. Buut your injectors mad an immediat dfferencee in site of the filthy TB and dle sensor as well as throttle position sensor...... Thanks your parts are A--One and fit correctly .....little hint a small bit a vasiline or silicon spray make those injectors go into fuel rail easily