Here are the most common causes of idle surge, 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
SOURCE: Buckin Celica
I had a similar problem with my 92 (same as yours). Does the tachometer jump around wildly when this happens ? Mine did until I found an intermittently grounded wire between the A/C plug and the tach input to the computer. Tough problem for you. Was easier for me because someone had placed a jumper wire on outside of the harness and that was the one with the short. I cut it and the problem stopped. Not sure on yours but sounds just like the problem I had.
Good Luck
SOURCE: 1985 toyota 4x4 22re missing and rough idle
Have you pulled out the spark plugs to see if there are any tell tale signs on them.They are a good indicator of many problems that occur and can save a lot of time isolating the problem.They should all be the same colour.Is the air box and lid properly secured with no leaks or splits in the intake tube.Have you put injector cleaner in the fuel tank to clear up any possible dirty injectors.Therse a few things your problem could be including engine vacuum leak which you can find by lightly spraying carburettor cleaner around suspect places such as inlet manifold and around injector seals.
SOURCE: 1990 Toyota Celica GTS. Idle races too high
sound very much like a vacuum leak.... also maybe your timing is off? possibly advanced? try retarding it with the distributor if thats the case...
SOURCE: squealing sound every time I start my van
you need to adjust the alternator belt, do adjustment a little bit tightening a bit. this will solve the problem. Or just change a new belt if the belt has crack.
SOURCE: 1990 Toyota Camry LE with the 3S-FE idle problem
the engine management system is trying to find correct idle speed/no fuel (when you take your foot of the gas above 850 rpm no fuel goes into the engine.help economy/egr system to burn off.try using a higher/lowe octane fuel to see if any change occurs.also try a gas treatment like unwins/redexe
Testimonial: "Hi I tried your suggestion on gas treatment and it seems to be working.I noticed in the actual owners manual it says to use 91 or higher octane gas."
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