Just put an Ofna 8 port on my Savage. Ran the first tank through no problem, started great and burned it out. Now it starts and dies when I remove the glow igniter, starts and dies no matter what. Also when it starts for a few seconds its throttle varies on its own. Now the compression of it broke the pullstart rope. What can I do? Is this normal for this engine? I've never had this much trouble with engine before and its my 8th engine. This is the tightest engine I've seen yet.