I am really not wanting to introduce cleaning products into this engine at this time. Especially after reading a lot of negative comments about doing so. I do appreciate the tip though as it might be fine to do. Old remedies like this can work wonders at times when other methods fail. I am having to modify a rubber tip to use to do a leak down test since the spark plug holes on these motors are so huge. It won't be til later this afternoon that I can see if anything can be found by doing this. I am so ready to get this behind me but love the challenge at the same time. I really don't want to break the motor down again so hoping there is another way to figure out and solve this problem.