[boxwrench]

I had an adventure with P1126 and p1133 last summer.

Fuel pressure is an easy test with a gauge. Screw it into the test port, turn the car on, etc.

You can look at fuel trims in Durametric. RKAT numbers are idle, often affected by vacuum leaks, purge valve, aos, etc. FRA is load/cruising trim, which is less affected by small vacuum leaks and more by fuel delivery issues (fuel pump, regulator, filter).

You can also see MAF numbers in durametric. You can also try just disconnecting the Maf and see if the car will run.

In my case it was a dying fuel pump, but a clogged filter or failing pressure regulator can do havoc as well.

Good luck.