I know this isn't the right forum for this but I need help with a problem. I posted this on the mechanic forum but haven't received a reply yet. I bought an Echo SRM 230 off ebay and it starts and runs fine but when I let off the gas it quits. I rebuilt the carb today with new diaphragms, gaskets and spring. I still get the same results. As long as I hold full throttle it runs very strong but it dies as soon as I let off the gas. What's next?