lost of power

There are lights on but the codes say misfire

Address the misfire first, this may resolve the issue, but it would n't hurt to perform a back pressure check on the exhaust, to rule out a plugged catalytic converter.

the engine does not seem to be misfiring. I was thinking that the exhaust being stopped might give a false code for misfire?

The engine module can detect misfires even though you're not feeling it. Plugged exhaust will not cause misfire codes. If the catalytic converter is plugged, then it is due to the misfires in the engine, and they will need to be addressed to prevent the cat from plugging again. So fix the misfire first and see how it runs, if there is still a power issue, check the exhaust back pressure to see if it is plugged.

what ia the best way to check the exhaust back pressure?

You need to connect a pressure gauge in the exhaust, before the catalytic converter. When the engine is running, and under load, the pressure should never go above 1 psi. or so. If the exhaust is plugged it will go above 2-3 psi easily.

Mine had an identical problme, but it was the ignition "coil bank" for the driver side. $1200 part, $200 labor

how do I get my car out of limp mode??