When im driving or getting ready to pull out of somewhere and. I floor it af about 3k rpms all my lights dim and as soon as i let off they come back up. They dont go out completly but close. Normal driving is just fine. Wjat cpuld this be?

 

have you had your alternator voltage checked? It could be the voltage regulator inside it is on its way out. If it has been checked and comes up good, I would look into seeing if you have a short some where.

 

I havent had it checked. My brother metionted it could be the injectors using more power or somthing? Not sure

 

your injectors have nothing to do with it - check your belt for wear or glossing and as MAGGZ said have your alt checked it more than likely has something to do with your charging system