I have a hyundai elantra 1.6 , flue injection and my car starts when it feels like and when it does start my car cannot hold the idle as soon as i leave the clutch it switches off or if i succed to drive it say by the second robot it will switch and i buffle to start it ,nor can i kick start it.
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It is a separate injector on a timer switch that is used for starting a cold engine. A cold engine needs more gas for good driveability. I think it would be located on the intake manifold, but not positive on your Hyundai.
It sounds like you have a vacuum leak or a stuck EGR valve. Check all the vacuum hoses to see if it will straighten up. You can pinch them off with a pair of pliers as close to the intake plenum as possible to see if it starts idling better. PCV hoses are also known to get large holes in them and can be a little tough to diagnose if you do not know what to look for.
This isn't answer but a couple of things to check or do. First has fuel filter been replaced? Start car and put it in gear. HOLD Brake and Give it gas while still holding brake hard!!!! Doess it buck or miss fire? You said it ran bad to highway. Explain Please !!! will answer after you reply.
If this car is injected it may be worn injector nozzles; ie they leak the fuel from the pressurised line into the cylinders after you've switched the engine off. The engine will then be hard to start for some time. If this is the case you'll need to remove & replace the injector nozzles.