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RB26DETT Engine Dies Immediately

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Hoping someone on here can help me out.  I was troubleshooting an issue where my 1990 GTR all stock, was losing power when coming to a stop.  Started up just fine, consistently died when coming to a stop sign.  Anyway in troubleshooting, I removed by AFMs opened them up and put fresh solder on the contacts and removed and cleaned out my IAC valve and installed a new gasket (there wasn't one before).  After putting everything together, the car started but then immediatly died.  It would start but die almost instantly and wouldn't idle.  I adjusted the IAC idle screw but no matter how far in or out I adjusted it, I got the same result.  Start then die.  The only way the car would stay on was if you constantly pumped the gas pedal.  attached my ECU talk cable and got an error 21 for Ignition signal.  Still a problem to look at, but don't see how it could relate to the car not idling and shutting off immediately.  Open to any suggestions!

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