2001 ford taurus, 3.0 vulcan motor. just rebuilt the whole motor, backfires out of the intake, seems to be out of firing order. i triple checked my work and can't find the problem. whistling sound of an intake leak also. changed MAF, pretty much everything changed. wont start, if it does, doesn't go above 500 rpms and backfires out of intake intire time. shakes violently. super frustrated could use advice.

has a timing chain, is set to tdc, i changed the camshaft positioning sensor and it stopped the backfiring, but still lets burning fuel out exhaust during stroke, so i think the synchronizer is bad because the chirping stopped before gas milage startd sucking and engine blew has a timing chain, is set to tdc, i changed the camshaft positioning sensor and it stopped the backfiring, but still lets burning fuel out exhaust during stroke, so i think the synchronizer is bad because the chirping stopped before gas milage startd sucking and engine blew