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This is most likely a vacuum leak. Check all the hoses and connections. Make sure there are no splits on the ends of the hoses. If there are no bad hoses or missed connections, take wd40 and spray around the entire gasket area on the intake when the engine is running. If it starts to smooth out, you have found the leak.
Tom, Generally, this is caused by either a vacuum leak somewhere on the top of the engine or dirty fuel injectors. Listen carefully for a vacuum leak [sucking air sound] at or near the top of the engine. Another way to locate a vacuum leak is to spray carburetor cleaner [aerosol can] at small areas, where there are vacuum hoses or intake gaskets. When you find the area of the leak, the carb cleaner will get sucked into the leak. This will generally cause the engine to run better. Try adding fuel injection cleaner to the gasoline tank. I recommend the Chevron Techron brand of fuel injection cleaner. Advance Auto and Costco carry this brand.
That could be a bad MAF sensor, check to see if its dirty. That could also be a engine vacuum leak check to see if you have a sucking air sound. If its a dirty MAF you can spray it with electronics cleaner. If you don't find any vacuum leaks and the MAF isn't dirty/ bad then check for restricted fuel filter, weak fuel pump, or dirty injectors. Start with trying to clean the MAF and check for vacuum leaks.
Its surely not turbo, its is somewhere a hole or leak in turbo air filter housing or air inlet pipe that is making noises when turbo sucks air. check the air pipes wheather they are fitted correctly. Take a keen look at air hose and close any hole with silver tape check the hose is fitted correctly in Turbo air filter housing (if not then it makes whistling noise when air is being sucked by turbo) . Clean all air filters and then give it a go.