02impalaLS

well ive had my car for a while now its almost at 100k and lately its been running like crap i want to know what should i do about a tune up for this car go to a dealer or some hole in the wall shop only thing i got added to the engine is a k&n intake and filter and my tranny has been actin wierd should i rebuild the tranny or just service it i am lookin for some help here thanks

Lingenfelter

Transmission: have the transmission fluid and filter changed - DO NOT have it flushed. Flushing is known to be suicide on transmissions with 100k on them.

Tune-up: Refer to owner's manual for maintenance schedule items.

Things you can always look at to increase performance/efficiency:
Plugs and wires (stick with ACDelco - stock)
Clean your air filter
Replace your fuel filter
Check tire pressure
Look for unusual tire treadwear
Rotate tires
Maintain a record of your milage (fuel efficiency), and see how you're doing. Most 3.8L Impalas see 22-25 MPG, mixed driving. Anything less, and your car is not running efficiently, or you're whipping it like a dead horse (since you're almost stock).

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pimpstrocity

Flush is no suicide unless you have never taken care of your transmission and the gunk left there is the last thing holding it together. If that is the case its only going to be a matter of time till it fails anyway.

capricewiz

if your starting to have troubles with the trans, I would have someone read the codes in the computer. Some codes don't set check engine lights. Have them scan it and let us know what they are if you have any.