Rough idle and stall when cold

Normally a rough idle when cold is due to an air fuel imbalance. So that means we have a fuel pressure issue that gets better when the engine warms up.

So let's start with checking the fuel pressure just to be sure it is not the issue. Here is a guide that will show how to do this:

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

If this checks out then we will need to check for a vacuum leak.

Basically if you have unmetered air coming in then the PCM doesn't know to adjust for it. However, once it is warmed up and it starts looking at o2 sensor data, it is able to compensate for it and the idle smooths out.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Once we run through these two issues we will have a better idea where to go.

Thanks

You are welcome. Please let us know how this turns out. We are curious to see what the solution is.

Thanks

They operate the same but the voltage readings they give are slightly different for the module to respond to. You will want to stick to the correct one for your engine.

Let us know how it turns out as that info will surely help others.