if this is covered in here somewhere im sorry i couldnt find it. but here is my problem i have a 2003 neon and here recently i have noticed that when the car is at a idle it has a jump in the motor. and it gets really bad when the a/c is on. i have replaced my plugs, air filter and coil pack cause i had a P0304 code pop up that told me there was a misfire in the #4 cylinder. since replacing the coil pack and plugs that code has come and gone but there is still that jump in the motor that has me a little worried. i even notice a loss in horse power when driving when cruseing in 5th gear i notice that jump in the motor. any ideas what might be causeing this.

thanks in advance for any input.

 

Do you get any other codes?

 

no i have not recived any other codes.