Hopefully that change fixes the problem but sounds like parts are being thrown at car and hope if solves the problem

This would have been far easier to solve by using a full OBD-II scanner (not a code reader)
Normally the LTFT and STFTs function + or - 5%
MAP reads about 35 KPA
O2 sensors read about 0.500 mVolts at idle along with :

Should show PCM has gone into closed loop once coolant temps over like 150 F deg
And fuel injectors pulse width ON time about 1-2 mSecs
and MAF reports around 1 lb, or about 2600 Hz
And exhaust temps per cylinder about 200 deg and be equal for all of them at exhaust manifold

 

Thanks for your input. I needed an exhaust manifold because it was cracked anyway. We were waiting to see if that cleared it up.

The shop hooked it up to a scanner and told me in 10 minutes there was a vacuum leak at intake gaskets.

I am supposed to get truck back tomorrow.

 

Scanner? They should have used a smoke machine or guess and throw parts at it.