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Earlier this evening I put about $10 worth of gas in my 2005 Hyundai Elantra. Since then I have noticed some 'jumping' when my car is in Idol. Whenever I come to a complete stop and attempt to accelerate again the car jumped as though it's going to stall out on me and has a hard time gaining acceleration. My check engine light went from flashing to being constantly lit up now. I didn't know if it was because I put that gas in my car earlier this evening and I just need to burn it out or if this is now turned into a totally separate issue.

Answers from the Automotive Experts

Amanda J. Pierce, MBA Tami, You may have acquired some water in your fuel, this can cause the drivability concern that you describe, I suggest replacing your fuel filter to see if this solves your issue first. You may consider replacing your spark plugs as well if it has been a while since service.

Gail Dunn, Owner at Women's Automotive Connection You could have gotten some bad gas (I have a couple of times). However, with the check engine light on, you need to find out what is causing the problem because once it is on it will not usually go off by itself. I would get some Lucas Gas Treatment and put it in for the first problem and see if that makes the car run better. Then go somewhere and find out what code the light is showing. If it is running well, have them clear the light and drive it again to see if all the problems have been solved.

Gelina Aquilina, Service Advisor / Mechanic at Sounds like a horrible coincidence. You'll have to have the car scanned for fault codes, but it sounds like tune up items are bad. Some shops read codes for free if you shop around.

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