There is a plate at the bottom of the intake manifold that has a gasket that can blow out and cause a vacuum leak and misfire. I highly doubt that the PCM is causing the problem. You may also want to check the fuel pressure, could be a weak pump.
Steering stabilizers will not cure or cause death wobble, they only mask the real problem that is causing death wobble. Oil pumps do not make pressure, they create flow. Bearing clearence and restrictions make pressure. It's the crank sensor.