[olddog]

Well since you didn't give much information to help people troubleshoot, I will give you an accurate answer, that may not help you much.

Your engine is running too lean. In other words, it is not getting enough fuel.

You might start with some information on, when did this start. Did it always run this way or did it used to run perfect?

Is it a carb or EFI?

What engine is it?

What carb is it or what EFI system is it?

If a carb, does it have a choke? If yes, is it Electric?