[jeremymik84]

Hey guys i have a 05 titan 4x4. I have a bully dog and a k&n cold air intake. i run 87 octane in it and i dont have the timing advanced or anything like that on it.. a few months ago it threw a p0171 and p0174 so i changed both o2 sensors and MAF sensor. It went away and ran great....for a while.. Now it has random lag in it and today it popped a p0301 (cylinder 1 misfire) and p0174 (bank 2 too lean) anyone came across this? any ideas?

 

[Tonedover]

bump

 

[jeremymik84]

think i may have located my issue... unplugged #1 coil and had no change in the way the truck runs which coincides with #1 misfire and system too lean ... i will be replacing the coil ASAP but just got to figure out what brand our trucks "like"

 

[danman]

think i may have located my issue... unplugged #1 coil and had no change in the way the truck runs which coincides with #1 misfire and system too lean ... i will be replacing the coil ASAP but just got to figure out what brand our trucks "like"

Did you disconnect another coil to compare a drop in rpm or excessive shaking/vibration? Did you check to see if power and grounds were getting to said cylinder plugpack?