Idle only on an Evenrude 85 horse

[Ford Aero X]

I have a 1985 Evenrude 85 horse engine that only runs at idle. <br />As soon as I try to advance the throttle, it dies.<br /><br />I have rebuilt the carbs, cleaned the leaf valves, replaced <br />the timing plate with the two timing sensors (one sensor was <br />electrically open), replaced the diodes that support the alternator. <br /><br />The timing is 5 degrees advanced at idle (per the manual), it starts <br />fine. But as soon as I advance the throttle and timing arm, <br />it dies (should advance to 25 to 27 degrees timing). I can advance the <br />carbs by hand and manually retard the timing and it runs up to <br />2500 RPM's. But it will not run if I advance the timing.<br /><br />All cylinders seem to be firing, each has over 90 pounds compression.<br /><br />Any advice?<br /><br />Ford Aero X