Any automotive mechanical shop. Expect to pay at least $75 though, depending on your engine make and model. The shop will likely suggest that you replace the spark plug wires and distributor rotor as well, and sometimes the distributor cap itself. This is normal and usually good advice but not 100% necessary if you're on a tight budget, the choice is yours, don't be pushed around. Beyond that, be sure to get second, and even third, opinions about any extra repairs, like brakes or mechanical repairs, that the shop may 'suggest' needs to be done.
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