Lean on two cylinders
So, I was replacing my plugs yesterday and noticed cylinders #4 and 5 appear to be running very lean relative to the other cylinders. I have noticed a decent stumble while under load (doesn't matter if MDS is on or not). There is no CEL on. I will try to get some pics of the plugs tomorrow. They are bad enough, I can't believe there is no CEL or major performance problems. I am getting a Trinity in the next couple of days, so I will be able to do some monitoring. I am tempted to get a couple injectors or at least swap the two lean cylinders to different locations to see if the condition follows. But, I would like to watch my knock, timing, etc. first. Anyone else ever see this? Thanks.
P.S. the truck has about 85k on it. I had Autolite Iridium plugs in it for the past 10k miles. After reading about not using anything but OEM plugs, I thought maybe the Autolites where causing the stumbling.
2009 Crew Cab 4x4 Laramie - 4.56 gears, Detroit Truetrac, Diablosport Trinity