HELP!!! Have a 2006 Miata that wont accelerate from an idle and some times wont accelerate at all or rev up. It is a manual trans. Manifold converter gets red hot when driving... Yes I've checked for back pressure issue and 2 separate gauges show no back pressure problems. Thought it was a lean running issue. Could not find any vacuum leaks, changed PCV valve and intake gaskets. Have tried to change air/fuel ration sensor, MAP sensor, Timing oil control valve, mass air flow sensor, throttle body and no luck. Will not set codes and don't have another one to compare numbers to with scanner. Any suggestions???? Some times the vehicle battery will die like it has a draw and other times it will start fine a week later. Been struggling to figure this one out.. Any experience in this is appreciated

Thanks,

Dan