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Hello. I have a 2004 Ford Focus SE. 4-5 months ago my wife's uncle replaced my intake manifold gaskets and pcv valve and hose. Ever since then my car has had a rough idle particularly when I am at a stop or travelling at a low speed, as my lights flash from dim to bright. What could it be? thanks!
 

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Could be a vacuum leak. If the problem started after all those gaskets were replaced, I would check that first. That would definitely cause the rough/low idle.
 

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Spray some starter fluid around the intake and pcv and see if the idle increases if so then for sure you have a vacume leak.
 
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