Subject: 2001 Galant spark plug assembly
Question: The Check engine soon light has been coming on intermittently, the dealer is saying this is the sparkplug assembly and needs to be replaced + 2 spark plugs also something needs to be blown out and the cost is over 400.00
please get back to me
Rich
Answer: Rich,
Anytime you get quoted that much money, you should definitely get a second opinion. I'm not sure what the dealer means by a "spark plug assembly". The only thing I can guess he's referring to is the either the distributor (about $670), the distributor cap & rotor ($45), or the ignition coil ($90).

I'm sure you would have been quoted much higher if it was the actual distributor. But even if he had to replace a couple spark plugs, some spark plug wires, the distributor cap and rotor, that still shouldn't be $400. But the dealership will charge the highest price for labor. I would recommend taking your car to a local mechanic and ask for another quote with the same items that the dealership said you needed. You'll most likely get a cheaper quote.
Good luck!