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Check your oil. If it's low, add some, if it's black, change it. Tapping noises usually occur when there's insufficient oil in the crankcase. Best of luck.
Greg
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I'd say you have a vacuum leak- maybe a gasket. Also check the egr. You can spray a little carb cleaner around gaskets to see if the engine responds. It will sputter or even stall if it sucks carb cleaner in. You'll at least hear the rpms drop. Be carefully as it is flammable. Also, there's a procedure to relearn the idle. Disconnect the battery for maybe an hour, start car with all lights, radio, a/c OFF. Let car run for several minutes.
Check the relays. Sometimes relay fuses will go bad or get stuck with age. Since all of this are probably on one circuit . Changing the relay may help.
Automatic or manual? May be low transmission fluid, or (less likely) bad CV joint. Have mechanic get it up on the lift and check for leaks, then spin the tires, see if the noise will manifest itself.
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