Check the following , faulty plug lead , faulty spark plug , faulty fuel injector ,vacuum leak number 3 manifold , burnt out valve compression test .
SOURCE: How do I replace the spark plugs on 2003 Hyundai elantra?
Go to www.hmaservice.com and register (veh by VIN). You'll then have access to shop manuals, service bulletins, wiring diagrams, etc. about your vehicle.
SOURCE: Correct torque on cylinder head bolts for Hyundai Elantra 1.8GLS
You have two bolt sizes the shorter or smaller of the two sizes is called M10 the torque is 22ft lbs +65 degrees +65 degrees again The larger of the two bolts is called a M12 the torque for these are 26ft lbs +65+65. There is a tightening order staring at the top center bolt and working in a circle They have to be torqued in three steps. If you dont under stand something about this repost and I can help you farther. If this is helpful please mark that it was I do this for free to help people DRIVE SAFE TIM
SOURCE: Hyundai Elantra 1999 timing issue
It's a '99 Elantra, have you ever replaced the timing belt? It is a belt not a chaing, so it is very much should have the belt changed. After 13 years if you haven't done the belt yet now appears to be the time to change. I have an '05 and we changed it over a year now.
Good luck!!
EJ Kudelka
SOURCE: my 2000 hyundai elantra idles rough after 5 minutes
check manifold, coil pack, tune up, injector cleaner too. Had mine 12 yrs now.
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