Car Idles Smooth With Spout Out, Horrible With It In!

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the computer is messing with the timing/spark tables. You could try to lock the timing out nd run without the spout in...or get something to control/replace the computer. I happen to have an A9L conversion harness with computer and BAP sensor for sale
 
As SQUEEZE&STROKE said, the computer is messing with the timing/spark tables. It advances or retards the timing as it deems necessary. What's your base timing set to, with the spout connector out? Most people can't run more than 14° of timing without problems.