GOOD NEWS. . . . The PICTURE UPLOAD FUNCTION IS WORKING !!! The tech folks at the parent company have been able to remedy the issue. You can upload pictures once again. Thank you for your patience.
Re: results of compression test GM305 1978(not running WOT)
Once you hook your vacuum gauge up to that fitting, make sure you do the test on the water so you have a load on the engine. I would bet it will lead to the answer to your problems.