Starting to get a rough idle
Over the past 3 days I have noticed that the truck has developed a rough idle when coming to a red light, doesn't do it all the time just every now and then and happening more and more. It kind of sounds like a misfire but when rolling it runs like a top. I have pulled the plug on the IPR ( plug on drivers side head in the front kind of by the fuel bowl ) and that seems to smooth it out. Have checked the ECM for codes and there isn't anything stored in the computer, is the anything else that could be causing the issue?
Any and all help is appreciated.
Thanks in advance - Robert.