I have a 1999 Toyota Avalon with 130,000 mi. Car has had regular maintenance. When I drive the car at 60 mph or over for longer than 20 minutes, and then I must slow down for an exit or to a traffic stop, the car seems as if it is going to stall at the slower speed and really seems like it will stall out at a stop sign at the exit ramp. If I park the car for 20-30 minutes then re-start, the car is fine. It only does this at 60 mph. I have had the car to the Toyota Dealership three times and they can not find anything wrong with the car. They did clean some injector system the last time on a guess. This has not stopped the problem. I try to avoid driving on the super highways but I live in a metro area- not always easy and adds a lot of extra time to my work commute. I would appreciate suggestions for a repair. Thanks

Asked by Dec 31, 2014 at 10:05 AM about the 1999 Toyota Avalon 4 Dr XL Sedan

Question type: Maintenance & Repair

2 Answers

16,245

Start with cleaning some sensors - MAF, O2, temp, etc. It may be your cars computer is hunting for the right air-fuel mix and not getting it right because of dirty sensors. The IAC (intake air control valve) allows the engine to breath when at idle or when your foot is off the gas pedal, it may need replacing. Hopefully you don't have a fuel delivery problem, you could perform a fuel pump pressure test and/or fuel injection pump test, Harbor Freight has some cheap tools if you want to DIY. It can't hurt to replace an old fuel filter too, if it's been a while.

2 out of 2 people think this is helpful.

Thank you, Ken. I will follow up with my mechanic on these suggestions. I have the oil and filter replaced every 3000 miles so the filter can't be too dirty but the other suggestions are very worth exploring. Thanks

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