[V8] ECU codes/poor running-idle

[John Dodd]

Today I build myself a LED test setup and on my 1990 ,automatic , 3.6 l
, I pulled the following codes:
2413
2322
1111
I remember the 1111 showing up when the dealer tested it 2 years ago.ECU
modified ,bad EPROM ?
2413 is only for the 4.2 l so what is going on ?
2322 inlet air temp sensor.BTW I have no idea where this sensor is
located.
Engine misses,idle goes down to 200 and up to normal again ,feels like
driving a 7 cylinder car.
Do you guys think that the symptoms match the code or is just some
effect of another problem ?
 
Thanks