Replacing the intake manifold gasket

[steveltx]

Hi,

I just had a smoke test on my 1999 Boxster. The garage identified a
significant vacume leak in the area of driver side intake manifold gasket which is
connected to the cylinder head.

I had this P1124/1126 code for a while and have replaced many parts that include
AOS, MAF, both oil filler tubes, oil filler cap, gas cap and even the fuel pump.

I should have done the smoke testing long time ago.

Is this a DIY task? Never replaced the intake manifold gasket before.
Where can I find more information about the steps for the job?
Anyone did this before? I apprecate your helps.

Thanks so much.

Steve