Hey all!

Looking to get some assistance with my Chrysler. Seems as though if my car sits for about 8 hours or so (overnight and at work), it pulses when the car starts cold. It happens for about maybe 10-15 second and then stops. The car idles normally. The Engine is a 4-cyl with a 2.4L PZEV. Anyone have an idea what this could possibly be?

 

Possible vacuum leak.

Possible check valve problem in the power brake booster.

Have the codes read to see if there are any error codes stored in the computer.