how do you fix it..car rides rough like its going ot shut down

Question

The car rides rough like it is going to shut down. It feels like it is misfiring.

Answer 1

The P3400 is for the Multiple Displacement System. The Multi-Displacement System (MDS) deactivates four of the V8's cylinders when the throttle is closed or at steady speeds, so right now the engine of your vehicle is probably running with 4 cylinders only. You should try changing the oil first.

P3400 CHRYSLER - Multiple Displacement System Rationality Bank 1

Read more: https://www.autocodes.com/p3400_chrysler.html