I've had an Aftershock for around 2 years now (never used it that much). I took it to my local hobby shop so he could show me how to tune the engine for me. He was very good at tuning it . He set my low speed needle for me and told me that it was set properly. He told me not to touch it. It seems to run fine but it keeps stalling every minute or so. He was not sure what the problem was either. He thinks that the engine mite not be fully broken in yet. I think he thought that because my Aftershock is pretty clean. I don't run it that hard, but I know the engine is broken in. I've had roughly 10 tanks through it (just guessing). I broke in the engine when I first got it. If someone can help me out with this id greatly appreciated. Thanks and have a nice day!