I have been trying to solve this problem for a while now. My truck is idling rough. I thought I had it fixed but it is back to idling rough. It started out idling rough and cutting out on me at stop lights and stop signs. I have replaced the IAC, idol position sensor, PCV valve and hose, fuel pressure regulator, EGR valve, new plugs, rotor, cap, cleaned the intake, checked vacuum ( tested 19 ) tested fuel pressure ( tested about 35 ). When I replaced the regulator I found a broken injector and replaced that. The truck ran great for about 2 days and now it is back to idling rough but not cutting out. Any ideas, thoughts, or solutions you guys have would be much appreciated.
P.S. I did not replace all these things at one time. It has been a test and replace situation. I think I am getting close to the fix but the low pressure fuel pump has been in the back of my mind since the beginning. I can hear the high pressure pump run when I turn the key but it is hard to turn the key and have my ear at the tank.
have the same problem?
Monday, July 29th, 2013 AT 4:55 PM