Update #2 Plus new question!
Final analysis of noise problem. Fan pulley has lost at least one bearing. Wobbles like a tree in the breeze.
Have ordered new fan clutch, clutch bearing bracket, pulley and removal tool.
Next question: Which way do you turn the allen bolt to remove the fan clutch? I've been told counter clockwise (conventional threads).
Also, ordered new Bosch plugs.
After fan is in working order will go to the hesitation problem.
One question I still have in my mind is that when I disconnected the battery didn't it remove all stored data in the computer chip. Hence, poor performance at initial start-up.
Would appreciate any responses.
Have a great day!