I'm having a problem with my echo trimmer. It idols fine put when i use it it runs at low throtal for a bit but then it just doesn't want to run high throtal. I pull the trigger but it just makes a low grrrrr sound and wants to shut off. Like i said it idols fine but as soon as i try and give it gas it just wants to give up it seems. Whats going on? can anyone help me out on this one. I've tried a few things and i'm gettin a little pissed off that nothing seems to work.