Service engine light flashing, engine is losing pressure, vibrating and misfiring

Good morning,

I would start by checking the compression in the motor to be sure there is no issue internally. You need 140-160 pounds in each cylinder.

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

https://www.2carpros.com/articles/how-to-test-engine-compression

Then I would check the fuel pressure to be sure there is sufficient fuel in the injectors.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Check for the spark to all the cylinders as well.

https://www.2carpros.com/articles/how-to-test-an-ignition-system

Let me know the results and when we have it narrowed down, we can pinpoint the failure.

Roy