Engine fault codes p1020 and p1031

Hi Every one
This Ami, I am new to this forum, I have a 2003 A2 FSI which has a the following errors:
P0301 Cylinder 1 misfire
p0303 Cylinder 3 misfire
p1551 Long term fuel trim additive air bank 1 range 1 system too lean
p1504 intake air system leak detected

The car does misfire when cold, but once warmed up seems to run much better

I have replaced all plugs & coil packs, I keep resetting the EML light but it comes back on again
could anyone point me in the right direction,
Many thanks,
Ami
 
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