atomic 4 engine will not throttle up in forward but will in reverse It will shift into forward and move forward very slowly, I push the throttle lever all the way forward but engine will not throttle up, I put her in reverse and I can throttle the engine all the way up in reverse. Any thoughts? we changed spark plugs, ignition wires all new, distributor cap new, changed coil, gas filter. cleaned out gas tanks and flushed out old gas