Engine is whistling loudly, and stops if i remove

You have to diagnose an ignition problem,
since you have the PO300 & misfires shown,
at least for many cylinders

Could end up just being one cylinder or several
that need whatever ignition parts control them

Individual Coils for each cylinder or a module that
applies to all of them

Wouldn't use the car until resolved
As it gets worse, you will ruin the exhaust converter

No idea on the whistle

Start the car, open the hood, remove the oil filler cap off the valve cover, if the noise goes away, the problem is in the "positive crankcase ventilation" system (blown diaphragm).

Remove oil filler cap and if noise stops, crankcase breather is blocked.

This is normal. With oil filler cap off, the vacuum pressure in the engine is lowered.

Charlie

OIL LEVEL CHECK Every time you stop for fuel, check the engine oil as follows:

1. Park the vehicle on level ground.
2. When checking the oil level it is best for the engine to be at operating temperature, although checking the oil immediately after a stopping will lead to a false reading. Wait a few minutes after turning off the engine to allow the oil to drain back into the crankcase.
3. Open the hood and inspect the level of the engine oil tank. The fluid level on the tank should read between FULL or F and LOW or L.
4. If the level is below the LOW or L line, remove the cap and add enough engine oil to reach the FULL or F line. Fig. 1: Fill the engine oil tank located under the hood first
   
5. Install the oil cap and hand tighten.
6. After filling the oil tank, remove the engine access hole cover on the drivers side. Fig. 2: Make sure the oil tank is to the F mark Fig. 3: The oil dipstick is located under the driver's side engine access hole cover Fig. 4: Place your finger through the hole and pull straight up to remove
   
7. Remove the engine oil dipstick and wipe it clean.
8. Reinsert the dipstick, push it in as far as it will go, the pull it out and look at the level on the end.
9. If necessary, insert more oil through the oil filler cap next to the dipstick, this will completely top off the system. Fig. 5: The oil dipstick has two markings for level check Fig. 6: To fill the crankcase, remove the engine oil filler cap

The engine breather pipe seems to be blocked.
It may also damage the oil seals.

The PCV valve may be plugged causing normally removed crankcase pressure to be pushed out of the oil cap. Replace the valve.

Read my other posts to the same problem. if the noise goes away with the oil filler cap removed you need to replace the oil filter housing and hose. good luk

bearing in the a-c ,sounds like it needs a new 1 .not a easy fix

Replace the oil filter after draining the old oil, and" BEFORE "adding new fresh oil, otherwise you'll be dump all that fresh oil, on the ground,while you "TRY to get the new filter installed.

Step 1 Remove drain plug,Drain oil into drain pan
Step 2 Remove oil filter
Step 3 Reinstall drain plug,qnce oil has drained.
Step 4 Fill new filter with oil,lube seal on filter.
Step 5 Install new filter, Add fresh oil to proper level.replace filler cap
Step 6 Run engine check for leaks.
Happy motoring!