Hello, Joe and Happy Thanksgiving!
While unfortunate, all things age. In aging, they experience decay. With what The Groove does, it almost always winds up being related to lost integrity of the intake system.
The very first thing to do is to read the instructions thoroughly to ensure you have done all you can, as well as you can. Most usually, we find leaks (especially in older vehicles) in the hoses and the various plastic pieces attached to dynamic vacuum.
The best (safest) method for seeking out external leaks where excess air is being drawn into the intake is by using an UNLIT propane torch, aiming it at the areas wherever such fittings may be found. Gaskets also should be given a close examination (did you check your throttle body gasket?).
Currently, I have tendered the entire Groove operation over to my star pupil, Michael Lee. You should reach out to him to assist with the diagnostics at a time when you can get under the hood.
Should that not yield results, then I want you to remember that I am always available for diagnostics.
Always.
But by contacting him first, you allow him to not only prove HIS worth, but also to hone his skills. I am trying to reduce my work load, looking at retiring when Life allows. But I will KEEP ON WORKING!!!
After all, when you stop giving back to this world, it tends to take you from it!
Please do what checks you can. Also, use YouTube as a resource for finding vacuum leaks. Learn the basics through tutorials, then focus in on your class of ride so that you educate YOURSELF.
In so doing, you will set yourself up to be tremendously more successful than your colleagues.
Be very well!
Thanks for coming in today. Nice to find another brother!