Help!!! Everytime I stop at a traffic light, my Focus surges and it feels like it wants to stall....even when I am in park with the car running! My engine light came on and when I took it to the mechanic, he said that it is a problem with the gas cap not being tightened enough. I asked if that would make the car surge and he said that my car is fine. It now has worsened and the light came back on in 2 days. If anyone has any info on this problem...please share!!!
Amber