Sometimes it will not start, acts like the clutch will not disigage to let the car turn over all the other electical works but the engine will not even try to turn over the sometimes it works fine. i think it may be a sensor or loose wire maybe but i have no idea where to even start looking any ideas??

SOURCE: Car turns OFF

I dnt know the name of the sensor, probably its name is ignitiator, or the one directly attached to the spark plug ..............it may cost some 5000 to replace one!!

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SOURCE: my buddy has a 2000

Have you checked the MAF and/or TPS sensor?. I have had the same issue before on the same kind of car and it turned out to be the MAF sensor.

SOURCE: 2001 accent transmission problem

If you have a check light on then of course that would be your best bet to go to Autozone or elsewhere and have them pull the codes for you to try and give you a clear understanding. If the light is not on but the car just does like you are indicating sometimes, then in almost all certainty it is the transmission speed sensor. They are not all that expensive (I had a Kia before and I believe it was around $30). And they are not all that difficult to change out. engine-light-help.com gives some information on speed sensors and some checks you can do. Hope this helps.

SOURCE: both fobs won't work, i

Put the key in and turn to the "ON" position and leave it there for 30 seconds. Then turn the key further to start the car. The alarm will then be disabled and the engine will be running. You have to then go to a dealership to get the fobs working again.

SOURCE: Hyundai Accent 1.5 Diesel. Intermittent problem

it sounds like a glow plug issue. perhaps a bad glow plug relay. I would think its the relay if the problem comes and goes. If it were a bad glow plug the problem would be constant. check for volts at the glow plugs next time the car acts up. If you find no volts, tap on the glow plug relay next time you turn the key on. This may cause it to activate. if so then replace relay