Car starts but dies

am99

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Jun 9, 2020
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Vancouver
I’ve got a 1988 LX 5.0. Recently the car has been starting fine but sometimes it does take couple tries to start. When I brake to stop at a stop light car immediately dies (90% of the time). Usually when I’m driving the RPM shoots straight down and picks right up. I have put in a brand new IAC. Please help!!!
 
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