I did ck vaccume whem I tuned it up. It was 17" at idle. Do you mean ck it while driving?? I will do a compression test, both wet and dry, but that will only tell me the compression rings and valves, right, not how the oil control rings are doing?? HR, what you say makes sense. Now, should I pour my blend into the cylinders and let it soak, or leave it alone? I don't want to make it worse!
