[jligg513]

I have a 02 elantra 2.0L and have been experiencing some issues with it. The check engine light came on and I took it to an autozone. they hooked up the tester and they told me that the #1 and #4 cylinders are backfiring and to change the spark plugs and wires. I did so and took it back up there when the problem still existed. they told me the exact same thing again. the car shutters when it idles and it idles high. It also seems like the clutch is slipping when I drive it. I am so far clueless and was wondering if anybody has any input for me. PLEASE HELP!!!!!!