Had the VX sitting for a while then tried to get it going just before winter hit. It ran OK for a while then started to gradually get higher idle. Then suddenly at start up it would start and fly quickly to 3500 rpm and then die....the only way to keep it going was to keep flicking the gas peddle. After it warms up it will run, has power, but will not idle less than 2300 rpm.

Have replaced:

Manifold Pressure (MAP) Sensor
Idle Air Control (IAC) Valve
Throttle Position Sensor (TPS)
Oxygen Sensor

did not replace the Fuel Injection Pressure Regulator, I'm ordering that now but not hopeful that could be the problem.

The car has power, if running on the highway you would not suspect there is anything wrong, it's running well on all cylinders. I had a local mechanic check the codes and he says all the sensors are reading good, and he suspects the computer is the culprit.

Does the VX have a ignition module AND and computer?
could either of those be the culprit?