Car is running rough?

My buddies 98 GT is running really rough at idle... after about 2000-2200 RPM it smooths out and seems to get better. anybody know what could be goin on?

Would be helpful to have a little more information. Has he ruled out the general maintenance items such as spark plugs, fuel filter, air filter etc? If it's running rough down low a dirty air filter could be to blame. Same with a clogged fuel filter. Or plugs for that matter. If those items are definately not the issue then a more thorough check is necessary. Could be as simple as an accessory dragging or a dirty IAC solenoid. Hard to say without more info

Thanks for all the help he has it sittin in the garage now dont want to drive it til we can find out whats wrong... I'll get crackin on checkin all those items early in the morning hopefully it is something simple... if not i'll definitely have another post lol
thanks again for the help

if all else fails get you some sea foam. i just did all that on mine. was a good time. cleaned the k&n new plugs fuel fiter was installed backwards (thanks john vance ford techs) and ran a 1/3 of a can of sea foam thru the vaccume lines let her sit for a few. made a fun smoke show for a mile or so and shes runnin better than when i bought it.

on a side note that shit is amazing. i do a lot of research on things before ill put them in my car and ive never heard anything bad. but for a car runnin a lil rough it can do the trick

see man thats weird cuz ive heard that sea foam causes lots of problems after you use it? But definately hope your car keeps runnin smooth

or keeps runnin at all huh? lol we will see. ive used it in some of the older mil. trucks before but this was the first for the mustang

Good lookin out man!

Might pull off the mass air and tb and clean them up. I've seens build up on the mass air do some funky crap