Where is the mac sensor locatedf - 2001 Hyundai Elantra

We all speak English, you post in Spanish! :>D

I have a 2014 ford explorer and when I go at mile 30 it starts to shake and it kind of drowns, I changed the spark plugs and the mac sensor something like that and I keep going the same way.

Check for OBD2 Diagnostic Codes. Find someone with a high end scan tool.

Clean MAF and Throttle Body.

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codes have several causes for showing up so post it all again with the code revealed if you want further assistance
posts are not linked

Check your mass air flow sensor and all vacuum hoses for leaks, your mass air flow sensor is located somewhere on the intake hose between the air filter box and manifold. Maybe loose wires maybe bad airflow sensor, could just be dirty, could even be timing advance or other sensors. Read codes from computer and go from there but likely something simple.

disconnect your MAF sensor and turn it on and see if it runs with out stalling. if it does, replace your MAF sensor, do not run your vehicle without it.

P0191 fuel rail pressure sensor circit
p0652 sensor1 low supply voltage
there first one is possibly a loose connection.
The second is the code for bad gas pedal sensor
replace sensor for gas pedal /check connector at the fuel pressure regulator

It is normal for your guage to to fluckurate a bit,

try disconnecting the sensor connector wires under the seat and the reconnecting them ,both front seats and make sure no coke cans or big mac wrappers under the seat to move about and unplug the wires

I don't quite understand your predicament. Where "Hook up scanner" displayed? What sensor did you unplugged expecting for a check engine light to come on? Please give more information in order understand and advice a solution if it's truly an engine misfire and not un-metered air passing into the intake system. More vehicle information would help, it's difficult not being part of the population that are psychic.

You replace alot of things but you should replace the EGR valve and the throttle positioning valve also. I would start with the EGR valve

There are 2 problems for code 34. First, is manifold absolute pressure(MAP) sensor signal voltage low. Second, Mass Air Flow (MAF)sensor signal-low airflow indicated.I dont have anything for the MAC.Hope this helps