Contribution Test Failure

[roddy]

1994.5 F250, 5 speed, 208,000 miles.
Engine has slight miss at idle...
AE Contribution Test displays DTC's
P0263 Cylinder 1 Injector Circuit Contribution / Balance Fault
P0269 Cylinder 3 Injector Circuit Contribution / Balance Fault
During he Contribution Test I can count 6 cylinders that make engine rough running and 2 that hardly make any difference, guess these must be #1 & #3 cylinders.
Is it just a coincidence that #1 & #3 are on the same uvch?
If there was an electrical problem would it necessarily set a DTC?
All injectors buzz at equal volume during Buzz Test which should rule out electrical issues?.
What are my next step's?

[pablito]

You can try loading up on injector cleaner, but you are due for some injectors at 208000.

[96F350KID]

Any other codes?

[roddy]

There is one other code;
P0605 Internal Control Module Read Only Memory (ROM) Error

[96F350KID]

If you have a chip in the truck that's where that code comes from. Your most likly due for some injectors

[pablito]

You can also get that from disconnecting the battery and reconnecting it. It sounds like the fuel side of the injectors.

Here is the seafoam injector cleaner process, it helped my tired injectors some, maybe you can benefit too.

Sea Foam | How to Use Sea Foam Motor Treatment