these are my symptoms:

-car sounds like the muffler is going. I guess it is missing . has been doing this for at least 5 months.-rich at idle-car started showing the code for speed sensor about a month ago(speedometer works)-car is now hard to start in cold or hot conditions. disconnecting battery seems to help. I'm getting code21 now-primary ignition signal circuit fault-car recently died while driving. restarted after disconnecting battery cable.-replaced ignition module and ignition coil

Did you ever fix this

I was wondering if you ever found out what was wrong with your 240 as mine is doing the same thing?