this post was submitted on 06 Feb 2025
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Hey! Having some issues with my Ford C-Max (2007) and wanted to ask if anyone's had something similar happen.

So the car starts having trouble when I shift into first and give it a bit of gas - if I give it too little gas it just dies. Now it's started doing the same thing in second gear too. When I first start the car and let it idle, the RPM drops every 10-15 seconds or so (from about 900), but it gets better after running for a while.

Got the yearly checkup recently and everything was fine, but then this started happening. Also got a check engine light that keeps going on and off every other day. It's pretty cold here, like 5 degrees if that matters.

I'm going to take it to a mechanic when I have time but wanted to ask here first if anyone knows what it might be? Maybe the MAF sensor or something with the idle control?

Thanks!​​​​​​​​​​​​​​​​

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Lots of things that could cause rough idle. Vacuum leaks and spark plugs are common culprits. Dirty/worn spark plugs are often accompanied by unburned fuel or soot in the exhaust.

You'd have to put a vacuum gauge on the intake manifold to check for a vacuum leak.

Beyond that, you'd have to check the diagnostic codes to see if it shows something else amiss.