Possible clutch shoe problem?

Now that i think about it, ever since i got a new glow plug, i have been losing them rather quickly. maybe it's because the new glow plugs made my engine run different and i lost my tune!!! that would explain why i lost one glow plug the first run, and why i might of lost one last night! And i do want to do a brushless conversion, but in the mean time, this truck has $200 into it, and i don't want to quit now.