Loss of power and check engine light flashed on and off

The engine will stall if fuel pressure is too low. You have a much better observation in the Check Engine light. That means the Engine Computer detected the problem, set a diagnostic fault code related to it, and it is something that could adversely affect emissions, so it turned the Check Engine light on. The first step is to read and record the exact fault code number(s). Chrysler made doing that yourself much easier than any other manufacturers, at least on older models. Cycle your ignition switch from "off" to "run" three times within five seconds without cranking the engine, leave it in "run", then watch for the code numbers show up in the odometer display.

You can go here:

https://www.2carpros.com/trouble_codes/obd2/p0500

to see the code definitions, or I can interpret them for you. If your truck is too new for this method, the people at most auto parts stores will read the codes for you for free, but be aware they're in the business of selling parts. Diagnostic fault codes never say to replace a part or that one is defective. They only indicate the circuit or system that needs further diagnosis, or the unacceptable operating condition. When a sensor or other part is referenced in a fault code, it is actually the cause of that code about half of the time. First we have to rule out other causes, or perform tests to verify that part is defective before we waste your money on a new one.

Fault codes have little to do with the Check Engine light. There are well over 2,000 defects the Engine Computer can detect. Of those, only about half of them refer to things that could adversely affect emissions. Those are the codes that turn on the Check Engine light.

When a problem is detected, you can get an idea of the severity by how it acts. For problems that won't affect emissions, the Check Engine light never turns on You can still read that code with a scanner or on Chryslers, by cycling the ignition switch.

For the most minor problems that could affect emissions, the light will turn on while the problem is occurring, and if it's an intermittent problem that stops acting up, the light will turn off while you're driving. As in all cases, that fault code will still be in memory and can be read later.

For more serious problems, the Check Engine light will turn on when the problem occurs, then if it stops acting up intermittently, the light remains latched on for that drive cycle. It will turn off the next time you start the engine, and not turn on again until the problem occurs again.

If the problem is still more severe, the Check Engine light will be on every time you drive the vehicle, even if the problem was intermittent and is not currently acting up. Those codes have to be erased before the light will turn off.

The most serious defects are when the Check Engine light is flashing. That means too much unburned fuel is going into the exhaust system where it will burn in the catalytic converter and overheat it. You're supposed to stop the engine as soon as it's safe to do so to prevent that expensive damage.

Even when the Check Engine light never turned on, or when we don't know the history of it on a customer's car, we almost always start a diagnosis of an engine performance problem by reading the fault codes. Without those to direct us to the circuit with the problem, we could waste days trying to solve most of them.

When you're reading fault codes in Chrysler Engine Computers, on most models that work by cycling the ignition switch, if you think you misread them, you can just turn the ignition switch off and back on once to restart the sequence. Also, on some older models, the sequence repeats continuously until the engine is cranked or started.