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Throttlebody may be excessively dirty and sticking. Thoroughly clean throttlebody and see if that helps.
PCV should be below and behind the intake plenum on the right side of the engine near the firewall. At this point the plenum will be off and you can do the plugs.
Sounds likr the main HVAC blend door actuator is not switching the vent from heat to A/C. Need to observe if the vent door is moving when you switch the setting.
Try replacing the blower motor resistor. That sounds like the issue.
Sounds like possible wheel bearing issue. Doubt noise is coming from the engine.
If you are lucky...it could be the output shaft speed sensor. Otherwise, see answer #1.
Need to get a valve cover gasket replacement set. The smaller o-ring style gaskets in the set go aroung the spark plug ports. Yours are worn which is why oil is seaping in around the top of the plugs.
Get engine code read for free at an autozone and post result on here. Probably is a spark plug ignition coil but, the code will tell the tale.
The blower motor resistor has burnt out and needs replaced.
Ever hear of cheap foreign steel dumped in the U.S.? Well, now you do.....some of it is in those wheel bearings.....