99 Mustang hard starting

In order of possibilities;

bad gas (water in gas (add a pint of Ethanol) fill up with 93 octane from a good station for a while)

change fuel filter.

your air idle bypass may need cleaning (gets full of crud, carburetor cleaner takes it out)

Read your plugs too. could have a cold one, full of oil/black stuff

Chances are this is not your problem but when my 99 went from starting right up to acting like yours I took it back to the dealer under warranty. They replaced a cam position sensor the first time.. that didn't fix it, the second time I brought it back they replaced some connection...that didn't fix it, the third time they replaced the alternator... that fixed it. Somehow a bad diode in the alternator was making it hard to start.

Well, finally have it figured out. I think it was a bad tank of gas. I ran it down to almost empty and refilled it the 2 days ago, and the problem has gone away. Starts much better now. Once I have time I will change the fuel filter just to be sure.

Don

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