get your throttle servo as far away from the engine as possible. I like to go at least 15 to 20 inchs away and don't have trouble. Having your throttle servo right behind the fire wall is almost as bad as putting your rx up there. Also use a resister plug if your aren't already. Keep anything connected to your rx as far away as possible ( on-off switch, batt., servos, ect.). Hope it goes well for you.