1992 mazda mpv, 6 cyls. it occurs a year ago after tune up. its luck power. during smog test, and now it cranks but wont go through when it start. changed the rotor, spurk plugs and cable

Well if it is not starting but cranking, it could be the timing belt and timing belt idleidler pulleys, there are three total pulleys. it could be none or some or one. but had that happen to mine and after putting new spark plugs, wires, ignition coil, and battery, finally found out my timing belt was bad plus 2 of the timing belt idler pulleys. once fixed today my car started and is still running.

Check your gas for possible water. Just in case try a can of SEAFOAM in your gas. It will take about 10 min of running to work. Also recheck the gap on the spark plugs it should be .044 gap. One other thing to check is the firing order and make sure the wires were put back in the right place to the right spark plug