i'm having the same issues along with a misfire on cylinders 2-6, also getting "system too lean", and engine sounds like it's running on half the cylinders and bucks when starting out from a stop. i've replaced:
1. plugs
2. wires
3. coil packs and boots
4. pcv valve and gasket
5. mass air flow...
i'm in the bronx and have been wheeling on beaches in nc for years and would love to go to a meet with you guys and get into some more off roading around here. however i am stock ride height and looking to do the 3" lift on a tight budget so i can get onto so 32"s and do some decent wheeling...
question for you when you did the lift did you have to change anything in the driveshaft or front axles? i'm looking for advice on the same thing on a budget like you, and what year did you get the tundra parts from? p.s i'm new to the forum and just starting to build my beast up and i'm looking...
so i'm getting multiple cylinder misfires as well. i've replaced all coil packs, wires, and plugs. the maf has been cleaned and new air filter installed, and all vac lines are intact and good. the misfire is on all cylinders but #2. It looks like i may have a head gasket oil leak. what else...