Q: Diagnostic scanner is reading an ignition coil issue

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Ok I'm trying to buy a car. It runs good and has good power. The only problem is when You Get to about 20mph it has s horrible miss/jerk. After you get over 20mph it runs great. I floored it and it had great power and no Mises After that. He is saying that they hooked it up to a diagnostic machine and they're telling me it's the igniting coil? Does this sound like the symptoms to you?

My car has 202300 miles.
My car has an automatic transmission.

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