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Auto Serv Of Hagerstown
I'm sorry that this problem isn't one that can be answered without looking and listening . . . If you are able, please drop it off some weekday morning and we'll check out the vacuum leaks and see if there is anything obvious causing it to idle rough or miss. If you've changed any other ignition parts (plugs, wires, coil packs, insulators, etc), please let us know when you drop it off.
The easiest way to get several pictures of where the intake manifold is would be to go to Google images and enter the request in the search bar. You will get dozens of images and all will show the exact location of the intake manifold. The intake manifold will be between the left and right cylinder heads on top of the engine. The exhaust manifold will be on the side of the engine.
After your vehicle sits overnight or for any extended period of time, the oil settles down into the oil pan at the bottom of the engine. When you first start it, there is residual lubrication on the top end internal parts but the oil pump has not pushed the motor oil up into the lifters, pistons, and valves. Therefore, you hear the tapping sound that then goes away once those parts are fully lubricated. We would have to take a look and listen to see if there is a need to perform any repairs. In the meantime, have a fully synthetic oil put in next time you have an oil change then listen to see it there is an improvement.