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I am having a problem with this fox mustang...

It starts right up every time, and the motor seems to run good/smooth reving it up and down while its in park.

However when I go to drive it pulls good/hard in 1st gear, but when I shift into 2nd it seems to bog/stall and hesitate a little bit? but when I shift into 3rd, 4th, or 5th gear it seems to pull good/hard again? It seems to mainly stumble in 2nd gear for some reason?

These are the codes I am pulling from it...

KOEO codes - 84, 11

KOER codes - 33, 13

By researching the codes it looks like I have a IAC, and EGR/EVR problem?

Would a bad IAC, or EGR/EVR cause problems bogging/stalling/hesitating like this while driving?

Also I know I should get a code 11, which I do on the KOEO test, but should I also get the code 11 on the KOER test as well? (because I don't)

Any input is appreciated...
 

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I've been having the same issues on my 2.3L getting almost the exact same codes... I see no ones answered you but did you end up solving the problem? I changed quite a few parts but I think I'm going to try blocking off the egr with a piece of cardboard and then unplugging the vacuum line to see if there's a difference...
 
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