keep coming same codes on a 2000 volvoS40

Question

Idle on my car up and down and have trouble strating all the time and when i turn it smells like gas.

Answer 1

Hi there.

P0300 indicates a misfire on random cylinders. Here is a list of possible causes. 

P0300 - Cylinder Misfire Detected Random Cylinders

Read more: https://www.autocodes.com/p0300.html

P0351 indicates an issue with ignition coil 1. Here is a list of possible causes.

P0102 indicates an issue with the mass air flow sensor. Here is a list of possible causes.

P0102 - Mass or Volume Air Flow Circuit Low Input

Read more: https://www.autocodes.com/p0102.html