Running on three cylinders

Hi Corey,

Did this start after you put the sensor in it or did you put the sensor in it for this issue?

Also, we need to find out what codes you have because it may seem like it is down to three cylinders but that is unlikely. Once we confirm what cylinders are misfiring we can go further.

If you have access to a scan tool that can monitor live data, let me know what the short term fuel trims are while it is warming up and then what it is after it starts misfiring.

Let me know this stuff and we can go from there. Thanks

https://www.2carpros.com/articles/engine-vibration-at-idle

The CPS was installed two weeks ago, showing codes of 0320,0700,1494. no check engine light. when it cools it runs fine.

Okay. Are these the current codes or were these there when you installed the CPS? The P0320 is for the crank sensor. The P0700 is saying there is a transmission code. The P1494 is for the leak detection pump.

The crank sensor could be your issue. Here is the diagnosis test that you need to follow to figure it out.

As you will see in this guide, a crank sensor that is beginning to fail will act up when it is hot and then when it cools it works find.

https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor

If these were old codes then do you have current codes? Also, we need to find out what the o2 sensors are reading with the short term fuel trims.