Rough idle self acceleration

SOURCE: 2001 hyundai santa fe hard to start engine after filling gas tank

not sure it should happen that fast but it may.... buy yourself a couple bottles of gas line antifreeze and put them in the gas tank... sounds like you have a lil water problem ... this stuff is basically alcohol (not the kind you drink) and it will suck up the water.

Robert

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SOURCE: 2003 Tiburon GT idles rough and stalls

First thing that comes to my mind is a vaccum hose. My girlfriends car did this and i fixed it with a piece of 3$ hose. If the light is on you can take it to your local parts store and they can hook it up to a device that gives them the trouble code. They can then tell you what is wrong with it. Do not let them sell you any parts until you confirm that this is the problem. They sold my g/f a 300$ mass air flow sensor when the vaccum hose was all that was needed. Have a friend rev up the engine while you listen for a whistling noise under the hood. If you hear one this could be your problem. You could also have electrical issues such as a bad coil pack.

SOURCE: Engine idling high in park. Will not start until

check your IDLER

SOURCE: Hyundai i30 Diesel automatic won't accelerate above idle at light

DOES THE ENGINE MIL WARNING LIGHT COME ON? WITH OUT MORE INFO YOU NEED TO CHECK MOTOR ON A CODE READER FOR STORED FAULTS, CHECK ALL AIR LINES TO EMMISION CONTROL, , SOUNDS LIKE YOU HAVE GONE INTO SAFE MODE, A SPLIT OR LEAKING PIPE ON THE INTERCOOLER IS A COMON FAULT ON THESE, IF YOU SWITCH ENGINE OF AND BACK ON QUICKLY WITH MOTOR RUNNING WITH OUT STALLING MOTOR AND IT CLEARS THEN IT IS PROBERLY THE SAFE MODE CUTING IN MEANING A FAULT HAS BEEN SEEN BY PCM

Testimonial: "Thanks.Didn't notice any engine lights came on. I had a problem free day today, but if it happens again will check warnings and PCM computer check"

SOURCE: engine high rev at stop and slowly goes to idle speed.

I've got Hyundai Lantra 1.6 year 2000. It's take time to start when it's hot. When I start my car it revs at about 2k-3k rpm. It also does it when I come to a stop. When I come to a stop it will stay at a higher rpm than that of idle speed. It drives ok when on freeway but uses more petrol. I have changed the water & petrol pump but no luck