I've 73K on my car and was too cheap to take it to dealer for tune-up so did it myself. I have done on my Celica 2001 GT:
1. Replaced Air Filter
2. Replaced Spark Plugs
3. Adjusted Throttle
4. Cleaned MAF and Throttle body 2 times with Air Intake
5. Changed Transmission Fluid
6. Flushed Coolant and Power Steering Fluid.
7. Bottle of Fuel Injector
8. Replaced pcv valve
9. Replaced Drive Belt with Gatorback Belt
It was running smooth for about a month and now I started noticing sluggish performace/lack of power when accelerating and also low idles (400-500) when coming to a stop. I've spend 2 days researching problem on different forums but haven't found anything. Could it be the Gatorback belt (last thing I replaced on my celica) or MAF that's causing this? Pls help.