Hiundai Magnus does not work 4th cylinder

Hello: I have a problem with a 2004 Hyundai Magnus. The issue is that the 4th cylinder isn't working at idle, but it idles normally at 3000 RPM. The spark plugs are new, the spark plug wires are correct, the spark is getting through, and the compression is normal in all 4 cylinders. If anyone can help me, please.

Hi, we'll have to start by checking the coil, primary and secondary, obviously ruling out that the cables are original and that there's no wiring confusion.

First, check that all the wires have spark, and check the injectors because I think that might be your problem.

THANK YOU FRIEND X YOUR HELP