How can I test if the cat is pluged. Would like to know the upstrem and downsterm presure and how to check this. Don't know much about how to test this. My truck seems to have no get up and go, code reads multiple misfires, idles rough at times but nothing is consistant. Already checked the fuel pressure and replaced the fuel pump. Any suggestions?
Jun 8, 2008 at 7:12 PM