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when i started to get a rough idle in gear cold and warm, with accessories on or off. with 269,xxx miles on it, I cleaned the Mass Air Flow Sensor, and Throttle Body. Using a Mass Air Flow Cleaner from BG and just a Toothbrush and Carb and Choke Cleaner on my Throttle body. about 6k miles later it returned with a slight rough idle, and I replaced my PCV Valve for the first time, now it purrs like a kitten.

Total repair cost 6.99 for Mass Air Flow cleaner from BG

3.99 for Carb and Choke Cleaner

9.99 for PCV Valve.

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Q: Why does my Toyota Echo idle rough when cold?
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