Question about 1991 Toyota Previa
Sounds like a possible vacuum leak, check to make sure all hose are connected and serviceable. Make sure your intake hoses/pipes are secured and fastened from the filter on to the throttle body. Also you can use a screwdriver to slowly turn the idle adjuster screw at the throttle body. This will Raise the idle of your vehicle. However only if all else fails.
Posted on Dec 14, 2009
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Posted on Jan 02, 2017
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Here are some of the causes of surges, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.
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