Developed Hard Starting

[NYSnakebit]

I have noticed the past few days when I've gone out to start the 'Stang it has a hard time staying running after it starts. It idles rough and then stalls out. It does start right back up again but will die again if I don't keep reving the engine.
When I swapped the engine some of the old hard plastic emission tubing broke and I replaced it with new pieces cut to size from Advance Auto Parts. The engine ran fine and there are no Check Engine codes. The engine isn't missing or skipping, but I am a bit puzzled as to why this emgine is doing this now. Ideas or suggestions?

 

[TBapp3]

WisH its something I could help yea out with...Hopefully someone will shime in! GL with her!

 

[Lethal_140a]

Check your IAC (Idle air control valve). That is more than likely the culprit. After cleaning/replacing that, I would then check for vacuum leaks.

 

[NYSnakebit]

I'll be digging into things this weekend a bit more now that I have the time. I also developed an exhaust leak on the driver's side at the manifold I'll be trying to fix this weekend as well.

 

[Timspony]

Clean the IAC with some Carb. cleaner....Your Mustang Does Not have Manifolds, they are tubular factory headers...

 

[NYSnakebit]

Clean the IAC with some Carb. cleaner....Your Mustang Does Not have Manifolds, they are tubular factory headers...

You know what I meant Tim. I'll pull the IAC apart tonight and clean it up. I should probably go over the vacuum lines I replaced as well. I hate troubleshooting vacuum leans, I know that. :nono:

 

[Timspony]

^^ That would be an excellent Idea!! ...after all the Pony is almost 20 years old!