Another good tip to check if your LSN is lean or rich is while the car is idling put your temp gun on it. For example go out and run a good hard 4-5 minutes to get the car and engine up to temp then pull it in and let it idle. After about 10 seconds put your temp gun on the head and hold it. If your lsn is set correctly your should see your temps drop 1-2 degrees every 4-5 seconds. If your temps are climbing your lean, if your temps are dropping drastically fast your rich. I've been using this method ever since I started running modded engines and my modder told me to do it this way. It keeps your from having your temps climb higher and higher the longer you run. Helps quite a bit for longer mains because your on and off the gas so much for turns and such if your engine is lean on bottom when it drops to idle it will cause your temps to climb and climb. You want your engine to be cooling while it is sitting there.