Check quotes on both labor and parts - They charge 3 times over MSRP. Here's my story:
Towed in for misfire. Diagnosed as coil 4. Replaced coil 4 - $754. Advised, "car is fixed". Drove it down the road, still misfired. Returned to Midas. Replaced all spark plugs. $812. Advised "car is fixed". Took it back few days later - still misfiring. Final result - hairline fracture in sparkplug - a sparkplug they put in. $1500+ for a spark plug. Refused to refund even a portion. Escalated complaint to Corporate Midas twice, no response. Filed with AZ Corp Commission. After 2 years of being a loyal Midas 90th Street customer, this is how I'm treated. Awful. Check the prices of coils and sparkplugs online - their coils are $153, MSRP is $51. They told me "well, at least now you have a tune up, and you wont need another for 100k miles." I didn't want a tune up. The sparkplugs and coils you threw out were good for another 30k miles. What a farce!