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the iac sensor is along the side of throttle body , did you give the throttle plate area a good cleaning out this is where the air path is for the IAC sensor , a lot of idle problems have been fixed with a can of throttle body cleaner and few good squirts of the stuff down the hole
Check for any trouble codes in the engine computer, and have the fuel pressure tested. If it is throttle body injection. observe the spray pattern of the injector when it pulses. You should see a cone pattern of the fuel spraying down into the intake. If it drips, or appears anemic, the injector might be partially clogged. Try some injector cleaner in the gas tank.
if you already replaced the fuel filter, it could be low fuel pressure to engine from a bad fuel pump. check the fuel pump relay first ! it could be getting hot and shutting down. check the fuse too. and run some good injecter cleaner in it, the injecters might be clogging up. good-day !
carborated or injected? could be vapor lock. could also be intake manifold gasket going bad, but unlikely. could aslo be cracked fuel lines allowing air into the lines.
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