As the title states I have been having a pretty major issue with my accord. The engine has been randomly cutting out on me while the car is in motion. When the engine cuts out, there is no sputtering or hesitation, it is as if someone shut the turned the car off and then will not start when you try to start it again, at first we thought it was overheating, but that was not the case. so far what I have done has not helped the problem, what I have done so far includes:

-New ECT sensors (all 4 around the distributor)
-New distributor
-New thermostat
-New coolant (emptied old, put in new, and burped the system)
-New ignition switch
-New ignition switch fuse
-New fuel pump

And the list goes on. As well as all that we probably made a mistake by cleaning the IAC Valve (since after doing so the car idles like complete crap when warm and misfires occasionally). Anyway's the only other thing I could possibly think of being the issue is maybe the ECU is going.

 

You never ever want to put any type of cleaner into the iacv when it is hot. If you do, it will swell the inner seals and cause them to go bad. If you did this then you now need another iacv. All you need to do is to clean the outer metal filter from time to time.

A common issue with these cars is the main relay goes bad. Since you haven't replaced that I would swap that out as long as it's never been replaced before and see if that cures it. Obviously if you've replaced that then that's probably not the issue.