Hi,
The code, P1520, isn't relevant for this year, make, and model. At least, I can't find anything in the manuals. I do realize it is a runner control code for other models.
The first thing I would suggest is to check fuel pressure. If it is excessive, then check to see if the fuel pressure regulator was left disconnected. It is under the intake manifold.
I attached a pic below and circled the regulator. If possible, see if you can see it using a mirror to determine if it is disconnected.
Let me know what you find.
Joe
See pic below.
Image (Click to make bigger)
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Tuesday, August 30th, 2022 AT 8:30 PM