Misfire in my cylinder

A bad plug wire would certainly cause a misfire. Spark plug wires aren't a huge expense, and your car sounds like it's due for a set. Pull the plugs and insect them, they may also be due for replacement (plenty of guides online for determining condition of spark plugs.) You can also check the plug gap with a cheap gap tool from any auto parts store. Replacing spark plugs and plug wires is fairly basic, check youtube for how to videos.

BSling answered 5 years ago My daughter drives an 01 Elantra that started w the minor symptoms you describe. We had numerous conversations with various mechanics and found many suggested possible remedies on forums such as this. We replaced numerous different sensors, plugs, wires, etc., that had seemingly worked for some others, but to no avail. In fact the driveability continued to get worse until it misfired so badly under any kind of acceleration that the car barely made it up shallow inclines. Fortunately, we stumbled across a suggestion for a diagnosis that apparently is quite common for this car, but strangely is rarely mentioned in forums and the like. Often, the original intake manifold gasket dries out, becomes brittle, and deteriorates, resulting in vacuum leaks causing a 'stumble' & a misfire in the cylinder closest to the failure in the gasket. Long story short, I replaced the intake manifold gasket, as well as the valve cover gasket, (as a result in having to remove it to get to the intake manifold) and my problem was solved. The car runs perfectly with no misfire whatsoever. As soon as i saw the condition of the gasket when I removed the intake manifold, I knew that was my problem. There are several ways that you can check for a bad gasket, although I'm not certain that these tests were conclusive in my case, rather it seemed that the descriptions of the symptoms I found more closely matched mine after trying seemingly everything else. Google for an image of a bad intake manifold gasket & you will see what I mean. I performed this work outside during cold winter weather, and it was not as daunting a task as it appears at first glance. If you have done any of your own simple maintenance in the past and have basic mechanical skills and sockets, you can save yourself substantial money by performing the repair yourself. There are videos and step by step instructions available online, & I found the most difficult part to be fitting my hand in a couple of tight spots for bolt removal. Tight, but doable. I hope that this helps you as I am all to aware of the frustration in not being able diagnose a mysterious condition, or having other posters fail to report back when they finally find the solution to their problem. Good luck.

I have a 2018 standard shift alerts and have been experiencing misfires what can cause this

My 2016 hyundai elantra gt, the other day twice when I started it was idling rough then I restarted and it was ok but engine was on for a few days. Seemed it was running g ok, took to autozone to test it and 2 cylinders misfiring was going to do a tune up, but after a few days my engine went out and the cars been fine, what does that mean? Should I still do the tuneup?