Intermittent sputtering dash lights

So my truck has been in 5 mechanic shops.....the last was Toyota service dept. and they said it's a fuel pump assembly issue and wanted $1750 to repair.
This truck will run perfectly, then out of the blue (usually on startup but not always) will begin misfiring like a bad plug or cylinder out. Dash traction light, VSC off and check engine light all on. I'll park it when I get home then start it the next morning and it runs fine...no problems but the dash lights remain on.
Anyone have a clue what's going on with this sick old Japanese lady?
Mechanics have changed the plugs and air injection pumps.

 

Maybe the fuel ecu or relay?? Cutting fuel to the engine?

 

Their saying now that it's the ECM. After another week of testing that's the diagnosis. Took a long time because they had to wait till it ran rough....slow process. Does anyone know where the ECM on this truck? Is it difficult to get to?

 

ECM is passenger side firewall. Pretty easy.. Never had to pull it out though

 

Thank you I found it. Yes, it doesn't look crazy hard to access. Drove the truck a short distance yesterday and evidently it (bad ECM) is effecting the transmission now, so it's progressively getting worse. I bought a refurbished one from Flagship in New York online for $465. Talked about 30 minutes to the owner, he had a lot great information. One being that the ECMs on that type truck begins weakening after 15 years.