Art , change the coil , have had 365/372's do the same thing , some will idle perfect but will not gain any rpms . I have seen alot more trouble with the blue coils than the black coils , Have had some blue coils that would idle and when you gave it full throttle it would take 6 to 8 seconds before they would gain rpms but as long as you held the rpms up over 8,000 rpms the saw ran fine