The aem is probably not sync'd with your timing. Explain the sync method you used to sync your timing wtih the aem...
You do not remove the spout to time an aem car.
I pull the spout connector and set the timing to 10 degrees. Then I plug the spout back in and use the use the software adjustments to sync up the timing in the software with the distributor.
I can't even get the thing started with the spout in. What do you recommend?