Land Rover Repair: 95 discovery, air flow sensor, co hc

Question
I read no vacuum at the intake port no matter what I do
even if its regulated I should be able to see something when I rev the engine right?

I forgot to mention I changed the O2 sensors also and still
it wont pass. could it be the air flow sensor?

Thanks
Ted

Answer
If there is no vacuum at the intake manifold port you probably have a blockage of coke or sludge in there.

As regards the air flow sensor . . . you need to find out why you failed and talk to someone who can test the systems and who will know which systems affect which readings (CO, HC, NOX)  Without that, you're just throwinf parts at it and hoping to get lucky.

Without knowing what you failed on, and the conditions (load, no load, etc) no one can advise you any further