Incomplete combustion is the cause of high hydrocarbons. Have the vehicle serviced. (i think the answer looked for here is what is the most common cause of the hydrocarbons. most know that HC is unburned fuel so the causes would be miss fire or bad plug wire or plug or even coil pack but it is bad ignition system that cause HC so look in that area even a vacuum leak so look around those areas)
Shift solenoid a malfunction. A failed solenoid pack is a likely cause.
A failed cv shaft or a broken motor mount are most likely.
The blower motor resistor/power module has failed.
A failed starter is a likely cause.
The usual cause is a failed blower motor resistor.
The common cause is a failed blower resistor.
The usual cause is a failed blower resistor, also called a blower power module on a auto temp system.
The radiator fan should not run after the key is shut off. The normal cause is a failed radiator fan relay.
The Alero is made by Oldsmobile not Chrysler. My first suspicion would be a failed fuel pump or clogged fuel filter.
The most common cause is a failed blower motor resistor.
There is a vapor leak in the fuel system. The most likely cause is a loose/failed gas cap.
Most likely cause is a failed engine thermostat.