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If it sounds like a baseball card in a bike's wheel spokes or a large marble bouncing around, it is probably the front half-shaft (driver side drive-axle) CV joint starting to wear out. Need to inspect to be sure.
I assume you mean the large flat plastic shroud under the front of the car. Basically it is a water and debris deflector to protect the components from excessive water, branches, twigs, garbage and other debris from hopping up into the engine compartment.
Is the blower motor running? (the fan turning on)
Go back to the shop and use your foot to 'rebuild' their rear-end. Get another opinion at a shop you trust.
Check fluid level and fill if necessary....Otherwise see answer #1
Try the estimator at the top of the page.
Look where your right foot goes on the gas pedal. Now look slightly up where the dash ends and you will find it.
Coils usually hold up just fine. As long as it is not cracked or other visual damage, struts alone will do.
Have alternator tested. New alternators will usually read around 14.4 volts. Don't know what yours is reading.
Multiple things. Dead battery or failed alternator. Blown main relay and other things such as out of gas unrealized because of a failed fuel level sender. Fuel pump has quit or blown a fuse. There are many possibilities.