Need some values for Sensors

[UptownImports]

Have a few issues i have a 2001 land rover Disco 2 4.0 V8 in my shop and need a value for the
MAF @ idle

What im seeing now on my scan tool is 7.0-9.0 grams at idle wich to me seems a bit high
we just replaced a O2 sensor bank 2 sensor one , last o2 sensor was dead no reading .and with the new one we are getting .865 volts and a voltage drop to zero after a few minutes after start up, all other o2 sensors are good and reading with in range.
b1s1 .465
b1s2 .465
b2s1 .865
b2s2 .465
readings were taken after cleared fault codes upstream sensors come on line after a few seconds then bank 2 up stream dies out.

right now the vehicle runs but has a slight shudder like a missfire and has thrown these codes since this morning

p0171
p0130
p0150
miss fires on cyl 3-7

Any ideas?

 

[Disco Mike]

The voltage from the MAF to the ECU should be between .5 and 5 volts.
By your remaining codes, both front 02's have circuit malfunction, which along with your 3 and 7 misfires is throw the 171 bank 1 lean code.
If you want some help with this, send me your number and I'll call you back.