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Originally Posted by AlkalineProdigy
Once it goes into closed loop it runs fine. First off the car sets no check engine light. So I took out the IAC vavle and put it back to default I reset the ecu by removing the battery cable. I took it ran it at between 35-40 so it would reset both the iac and ecu. But after a cool down it still has the rough idle. The fuel injector run runs a little rich and speradic before closed loop but again once it gets hot enough to go into closed loop it runs fine. Since its a 91 autozone or checker have the code checker for the computer but since its not showing the check engine light it might not even have any codes. Also I checked all the vacuum lines and they are all connected.
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Datastream and bad O2 sensor...