FYI: Just replaced the vacuum hoses from the idle control valve and from the valve cover to the aircleaner and manifold.
I can feel the engine is smoother and so far, no hesitation:-)
The hose from the manifold to the valve cover was very old and did not seal well. It was crimped somewhat as well.
I think I am confirming my on theory about little things adding up.
A few more items to go. Air filter, O2 sensor, sunroof cable and an oil change.
Also, I cleaned around the engine compartment while I had the air cleaner box off. Cleaned the box as well. It may sound basic, but make certain there is no remaining debris near the intake plenum when you put the air cleaner top back on.