Since we have had first snow up here in Minnesota, it's time to deal with off season maintenance. Have been trying to figure out an issue with engine, and wondering if anyone has had experience similar. Under race conditions I am entering a roughly 65 mph corner and coming back on to power and hitting something that is similar to a turbo lag. Hit full throttle and acceleration seems to go flat then picks up throttle suddenly. Tough part is it comes on suddenly and induce wheel spin. Have thoughts it could be mechanical advance in distributor or possibly float level in carb. Any suggestions would be appreciated.