L322 4.4 M62 running fault

I have owned my 2003 l322 4.4 M62 Petrol for 5 years and done 50,000 miles in it. It is now it's 160,000 miles. In this time it just been entirely troubled free! Everything still works! But now I have a fault and it's a pig!!!

Over the last month the car started coughing/hiccupping whilst driving or whilst maneuvering a trailer at low speed. The cough is now developed into an inability to to idle at all on first startup and when you press the accelerator it the engine dies. It is now undriveable.

The engine management light is not on.
There are no fault codes
I thought it might be an air leak but the intake hose is good.
I fitted a new air mass metre but no improvement.
I am now stuck, Any ideas?

Smoke test it they are known for vac leaks dispite the intake hose bing ok.

In tank or intermediate fuel pump could have failed causing fuel starvation.

Datatek said:

In tank or intermediate fuel pump could have failed causing fuel starvation.

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is there a way to test this?

biketeacherdave said:

Smoke test it they are known for vac leaks dispite the intake hose bing ok.

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I'm told it would have to be a massive air leek to cause the problems I am experiencing. Where else could there be a vacuum leak?