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can be many things.

but on 90

bad iSC or dirty

TPS switch not closing , telling ecu to control idle.

or timing belt slipped.

Egr valve sticking open

http://www.kick-fix.com/

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Q: When you start your 90 tracker it idles fine as it warms up idle dops badly almost dies then back to high idle it does this serveral times before idle levels out?
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