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Originally Posted by marc-o-matic
Sounds like coolant temp sensor unpluged or bad(just a guess)
The coolant temp sensor is one of the computer inputs(major input for fuel metering)
ie. when the engine is cold it requires more fuel,when it is at operating
temp. it requires less fuel(just like a carburated engine has a choke)
If it is unpluged(or bad w/open circuit) the computer thinks it is 34f below!
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Just put a 3.1 in a Z24, had multipal problems, non working MAP, bad fuel pressure reg. bad cold start sensor, bad IAT sensor, and NONE of those did anything like you are describing. If i were to guess? fuel pressure regulator or ECM. (fuel press. reg. can go bad in different ways, well... make car do diff. things) sounds more like injectors are not shutting off, a ECM problem