well, elevation is obviously not your problem. I thought maybe you were at some high elevation. Whats the ambient temp and what are your settings for glow, propane and kerosene. Your sure your battery voltage is good ? Best results seem to occur with voltages above 7.3 or 7.4. Did you check the tighness of the screws on the back of the engine ? Feel free to give me a call next time your ready to tinker with it. 817 465-6656 or 817 874-3734 cell.