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u may have gotten bad gas and fowled all the plugs, try a fuel water remover, posbly change the fuel filter. Some time the idle air on the throttle body can get stuck and wont let it idle. Does it idle well with a foot on the gas or crappy?

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Q: What should you do if your 2003 Hyundai elantra will only start if you step on the gas and stalls as soon as you let it go after fuelling. I changed the fuel cap?
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