im working on a 92 ranger 3.0 and i just changed the engine in it.. the timing is being a pain we keep getting #1 on top dead centure. and getting it timed. but i have 40 psi of fuel.. but i noticed there is lot of ait bubbles in the gauge that im useing.. but i cant get the danm thing to run.. the engine has 40 k on it. good preasure to the filter. and it still.. does any one have any ideals.. and it keeps back fireing in the intake..