Hey all, I've got a standard duratrax .21 mill that goes through a glow plug every couple of runs. I feed it trinity 20% fuel and I've been using the best plugs I can find with the factory carb settings but nothing seems to help. It's about 24 tanks old; do I need a rebuild or should I be shopping for a new engine? Any thoughts/ suggestions/ random guesses would be appreciated. Thanks!

whats the plug look like when you pull it out?

Worn rod can cause it to eat plugs.