Help Please!!!

[cnilkyrclit]

Hello All, I Have A 93 Lumina Euro, When I Go From A Stop To Accelerate The Lights And Everything Dim Out. And The Car Seems To Lose Power For A Quick Second And Then Everything Brightens Up To Normal. The Alternator Was Replaced About 2yrs Ago. It Has A Lifetime Warranty, Purchased From Autozone. Also A Brand New Battery Last Winter. Can Someone Please Help. Also While Sitting At A Light, The Idle Seems To Go Up And Down (between 200-300 Rpms). What Could Be The Prob. Ignition Packs Replaced Early This Summer As Well As A Tune Up. I Do Need A New Oxygen Sensor, But I Dont Think That Will Cause These Problems.

[dwalmop]

Huh, weird symptoms. Is the belt slipping from the alternator maybe? Although you'd probably hear a nasty shriek. This happened to a friend of mine (on a Ford Coutour SVT) and it only happened when he reached about 5000 rpm, but the same symptoms, and his alternator being bad ended up being the problem.

[Kooterskkar]

It may help to replace the serpentine belt. The up and down revving could be a vacuum leak or sticky IAC valve. Ive also heard that a bad TPS can make the engine rpms jump up and down at idle. First thing I would do though is give the intake and throttle body a good cleaning.

[cnilkyrclit]

new serpentine belt and tensioner, thank you though. im puzzled!!!! how do i go about cleaning the intake and throttle body?? and how can i tell if the tps is bad??