Why is my car running so rough?
 

I have an 01 Hyundai Elantra GLS with 195k miles on it and it refuses to run smoothly. When idling, it basically fights itself. It'll make a popping sound through the exhaust, sputter, almost die then rev back up and run okay for like 10 seconds. Then it proceeds to repeat. It has a new coil, plugs, plug wires and a tank of fresh gas with Iso-Heat in it. Is there a sensor or something that is known to cause it to run like this? Thanks in advance.

Crank and/or cam sensor affect the timing of the spark and fuel injection

Hope you fixed it

I suggest that you bring your ride to a reputable Hyundai dealer to have it properly diagnosed.