Well here we go again. Pull valve cover and verified timing marks and ran a compression test on a room temp 40 degree motor. 90 up to 125. Ran valves and got compression on low cylinder up to 105 which is now in tolerance. Pulled codes again and 166 flashes 3 times and then starts over. What in the **** am I missing? We are turning in to parts replacers....... we replaced the vaporizer awhile ago because I thought it was getting no fuel but won't even run on either. Even tried a new ecu and coil and pickup. I wasn't a real big gm fan before this but now I know why I like the 2.0 and 2.2 Mazda a whole **** of a lot better.