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Hello, my name is ***** ***** I am a professional here at Just Answer. I have noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.If it seems to be running like its out of time try installing your timing light and pull the SPOUT connector and check the base timing, it should be right at 10 degrees BTDC and hold steady. If so then plug the spout back in and run the engine up to 1500 RPM and watch the timing and see if it advances and hold steady at about 20 to 30 degrees. Check this for me and post back and we can work from there.
The SPOUT connector should be in the harness next t the ignition module and it does look just like the one in your Mustang. Makes sure you pulling the correct one. If the timing was set with out pulling it , then its likely way out.
The engine should start with the SPOUT removed because you only placing the timing at base which should be 10 degrees BTDC. In most cases if the ignition module fail's you loos all spark and it will not start at all. Go ahead with the filter and the fresh gas and if possible let see if there are any fault codes setting. This may take a few back and forths to figure out what going on here to bear with me,