If I start it and leave it to warm up it sometimes slows to normal idle then surges back to high idle
SOURCE: 94 Toyota 2.4 engine idles fast. when warms up it starts surging
sounds like an Idle air control valve or a positive crankcase ventalation valve(or pcv valve). use some intake cleaner in the air intake and take the pcv valve out and shake it it should rattle and move freely. mike
SOURCE: Idle surges when it warms up.
sounds like an engine management fault it will need to go on a computer
SOURCE: 1991 Camry with 2.0 L, 4 cylinder. When it is warm
Early 90's had a thing called Idle Stabilizer valve.It should sit on the top of the motor,some models had it sitting on the side of motor.Anyway this part is about 4-5 inches long,abou 1-1.5 in diametar and it has vacuum hoses connection and electrical conection.I'n most cases,the diaphragm could be dirty,thus restrictin internal part to slide back and forward.If you are handy,locate the ISV and remove it.Use some brake parts cleaner( can use up to 1 can) and clean it good.When cleaned spray, just a spritz of of WD40 on each opening and reinstall it.If problem still persist, you will have to purchase a new one that will run you about $200-325 buck.Hope I could help.
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