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Ok, if nothing on a visual check, it needs to be smoke tested, but in place of that, the next best way is with carb cleaner. You will need a helper. Have your helper crank engine and put in drive with foot on the brake. You take a can of carb cleaner and spray each vacuum hose one at a time, including the pcv hose and brake booster hose(if vacuum booster), then spray the air intake tube, then around the base of the intake. If one is sprayed and idle changes(smooths out or increases), that is your culprit.
If no difference, then we will go from there
Ok, digging deeper, there is a service bulletin out that has several of the symptoms. It calls for installing a shim between the cam sensor and engine where it bolts to and if persists, to install new cam sensor. I have attached it for you