Freelander 1 td4 no throttle response

I recently replaced the clutch on my freelander 1, 2 litre td4. As part of the job I had to remove the inlet manifold. After the job was done I put the inlet manifold back & reconnected everything. The engine is now very lumpy on tickler and even with the throttle flat on the floor it won't rev at all. Also the heater pipes are red hot within two minutes of starting it up and the metal breather pipe in front of the lhf wheel, is blowing hot air and is also hot. It appears through the front bumper. I'm at a total loss as to what is causing this. Please help.

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www.landyzone.co.uk/forum

Freelander 1 and 2:
https://www.landyzone.co.uk/forum/land-rover-freelander.9