I have a Johnson 60 HP TLET. VRO is removed, I'm mixing 50:1 in the tank. Starts and runs good. After idling or running at slow trolling speeds for awhile it will shut down. Won't troll with th trolling plate down. Stalls on acceleration from idle or slow speed. Primer bulb does not stay firm, goes soft. Will only start with difficulty when this happens. Accelerating quickly will keep it running. Any suggestions as to what my problem is. Service manual says check filters and anti-siphon valve.<br /><br />Help!<br /><br />------------------<br />pfish