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Re: 2002 bmw 325i running rough
Did you replace your fuel filter when you did the pump? At lower RPM's the engine would be starving for fuel. Another cause could be your throttle position sensor. It is what shifts your transmission at predetermined shift points as you throttle up and down. It is also what kicks down your engine when you are stopping or slowing down as you go down through the gears. Hope that helps!
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Sounds like you have a small bit of dirt or grit in the fuel system when accelerating it is drawn with enough force to cut off the fuel supply then is released when engine at Idle. 1 run liquid fuel line/injector cleaner in 1 tank 2 check fuel lines for debris 3 change fuel filters 4 have fuel tank flushed here is trouble shooting order less expense to greater.
The check engine light could be any number of things and the only way to find out is have the codes scanned. The brake light issue is common on E46 3 series. It is an issue were the brown ground wire that goes into the lamp housing melts at the connector causing a loose ground connection. The connector needs to be replaced and also add additional grounding wires to prevent further issues. And for fuel additives either use the cheveron techron, or the bmw fuel additive(the bmw stuff is the exact same thing, so just use which ever is cheaper).