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Re: 99 Avalon Engine Miss
Not sure if this is same problem I had on a 99 Avalon, but after running on interstate for a while at high speed, would get a "miss" - actually a very rough idling condition. Ran "ok" at higher speeds, but when slowed down or stopped - terrible idle.
However, after car cooled off, it ran fine, until engine got somewhat hot again, then same problem. During all of this, it never once threw a check engine code. I checked out numerous items on the car. Finally I took off the EGR valve and cleaned it thoroughly (numerous times) with thottle body cleaner, and worked the spring up and down a lot during the cleaning process, and viola' - no more problems since.
Some other recommendations of items to check (I received from other people):
1. Check vacuum lines for leak
2. Check air intake for cracks
3. Clean MAF sensor
4. Clean throttle body
5. Check throttle body position sensor
6. Coolant temperature sensor
7. PCV Valve
8. Idle Air Controller (not a cheap item)
Good luck and I hope this helps.
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