, that is a choke rod your seeing, it has a pick up on top of the engine. When I get home from work I will first move the ignition, and maybe the throttle servo as well. I will also replace the old analog servo with a digital as well as re check my wiring and make sure there is proper spacing between ignition wires and any thing else. The plug cap isn't the old rubber type, it's like the newer ones. I'll post a pic. To me it looks to be ok, but then again if I knew, I wouldn't be here asking questions. One thing I DO know, this bird won't fly until it's straightened out. I have almost two years into building it and I'm not about to stuff it into a black garbage bag now just because I didn't want to wait . Lol. Heck, I won't even taxi it around the yard for fear that the throttle servo will start doing it too. I am confident that with all the help from you guys who know a lot more than me, I will get to the bottom of it. Here's the plug cap.