Question

2008 Pontiac Solstice trouble codes P0010, P0087, and P0090 fuel pressure is at 70 at idle, will not accelerate

Answer 1

P0010 Intake camshaft position actuator solenoid circuit

P0087 Fuel rail pressure (FPR) too low

P0090 Fuel pressure regulator control circuit

The most important code condition that has to be inspected more closely is P0087 , The fuel rail pressure (FRP) sensor share a 5 volts reference to the MAP sensor, the fuel tank pressure sensor, the Accelerator Pedal sensor, and the MAF (mass airflow) , If the FRP short to power it remove the 5 volts reference to its shared component, which will result in no acceleration and possible rough idle. or low idle or no idle. Correct thecondition  for the FRP sensor. You can also disconnect the FRP and retest for acceleration.