94gts, don't get me wrong i love my stang.....but because my supervisor won't transfer me closer to where i live i have to drive 40 mile round trip to and from work, not including any extra....so i'm trying to be able to save alittle on gas....i was getting 200 miles to a tank, but i was having fuel ratio problems and studdering problems until i had driven it around 1 mile so i timed it around 14* and i couldn't keep the rpms above 500 rpms and it wanted to surge to the point of stalling out, so i went and had it diagnosed....i found out it was both of my o2 sensors, so i timed it down to match my wifes car, but seem to be lacking power...so should i try and time it to 10* ?????