Oldsmobile Alero Engine Knock

I Have A 01 Olds Sleep 3.4. I Had A Head Gasket Leak I Replaced Gasket Heliocoiled All 12 Rocker Arm Bolts Put It Back Together. Runs Fine...

When I Turn On The Ac Compressor My Engine Pulls And Makes A Knocking And A High Pitched Noise. The Cooling And Heat Work Fine But When On...

I Have A 99 Oldsmobile Alero 2.4l, It Has Stalled A Few Times. When The Engine Was At Operating Temp; When Put Into Gear It Would Die. I...