i got a question about my girlfriends 03 mazda 6. 4cyl?

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civicsikid07

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ok so when we drive with the a/c on for a while the car will start wanting to drive by itself... and even with the brake on it will start doing a weird skipping thing.. then if we put the car into neutral the RPMS aren't below 1000 they are right at 2000 or a little over 21, 2,200. her dad said he put some R134-a in the car last year and he said he thinks he put to much and that's making the engine work twice as hard to turn the compressor and that's making the car do what it is doing.
i just want to know why the car wants to drive by itself when the a/c is on
i know about the RPM's thats not what im wanting to know, i want to know why it wants to just drive after a bit of driving with the a/c on
 
It could be a problem with the throttle body. I can't be sure, but the weird skipping thing with the brake on is most likely knocking or a misfire. My dad's Sable did the same thing. It ended up being the throttle body once, and then it came back and it ended up needing new spark plugs and spark plug wires.

If you are somewhat mechanically inclined, I would suggest trying to replace the spark plugs and wires first by yourself. (about a $50 fix if you do it yourself, $600 if you go to Mazda) If that doesn't work or you don't want to try that, take it to Mazda to just get it checked out. they could tell you exactly.
 
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