ORIGINAL: redtailhawker

my brother just bought an mt2, and we started breaking it in, but we had some problems. His glow plug wore out really fast, so we went to our hobby shop and got some lightly used ones, because they didnt have any new ones. We put them into the engine, and it started up but instantly went to full throtle,and stayed there no mater what we did. we pulled the throtle back manually, and nothhin. We run 20% tower fuel. I couldnt figure it out untill i thought of the glow plugs. Could this have been the problem and if so, what temp and brand of plugs should I buy. Thanks in advance for the help