first of all, is your Vin within these ranges:
1HGCG2......YA000001 thru 1HGCG2......YA035748
1HGCG1......YA000001 thru 1HGCG1......YA076104?
if so, when the problem is occuring, remove the fuel pressure regulator. keep in mind there will be a lot of pressure in the lines from fuel pump residual pressure(around 45psi) and if the fuel is boiling in the rail that pressure too, so fuel will spray out initially. watch your eyes. after the pressure release, remove the regulator quickly! you will be able to see fuel still boiling in the lines! it's really cool! i say to do this because this is an expensive repair. the pcm is not cheap.
the replacement fuel pressure regulator increases it's opening point, holding more pressure in the fuel lines. higher pressure means higher boiling point.
the replacement pcm is updated to work with a higher fuel pressure, so it reduces injector on-time to keep things happy.
there's the pcm location and the part number. the kit contains the new pcm and fuel pressure regulator.
you'll probably notice this only happens in cold weather when it's unseasonably warm some days. it's a problem with the winter blend fuel. this fuel is specially formulated to improve cold weather driveability. this fuel has a lower boiling point that normal non-winter blend fuel. it's a seasonal problem, if you can live with it, try to. $$ is $$.