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well as you guys may already know i just put in the big evo 3 16g and i just got it back from the shop,so this is the problem...i was driving my car not speeding or anything when i come to a red light and my brake light and battery light turn on and my cars rpm go from a little under 1000 rpm to about a 1500 rpm, what could the problem be? a sensor,the battery what can it be? give me your thoughts,should i be worried? my car runs beautiful still

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When I first got my car it did something sort of like that. Does yours do it all the time or just that once?

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it does once in a while

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can someone please help

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ISC.
Does it mostly at idle?

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I had a similar problem a whiel ago, when you are driving and you put in the clutch does it do it too?

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It sounds like another charging issue to me. Check your alternator output and battery then get back with us.
Have it checked at Autozone and look at the display on their machine. They don't really know what to look for other than the voltage output it seems, so keep an eye on it too.

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but is it something i should be worried about?i got my alternator changed about 2 months ago

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...is your battery light still on?

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if goes on and off when it wants to