I have a 1997 Chevy Blazer with 194000 miles on it. Just replaced fuel pump and after doing so engine ran good for 1 day then started running ruff and set a code for misfire in #4 cyclinder. Checked compression on all 6 cyclinders which ranged from 140-160 psi have good fire. Plugged are gaps as required. Checked under plenum with no indication of fuel leaking. I have also checked the fuel pressure and getting between 55 and 60 psi. I am stuck on trying to figure out the problem. If anyone could give me some suggestions on what it could be I would really appreciate it.
Thanks.