94 gt

Background on me:
Had this mustang for about 6 years. Never had to work on it cuz nothing ever broke, so I have limited knowledge about mustangs. Was into DSM's then motorcycles. Now I decided to start modding the mustang with some basic mods. .
Back ground on the car:

5.0 5 speed. 270k on the original motor. x pipe,flow, msd blaster. Car was running fine. The other day I go it alittle comming out of a parking lot. Car sounded like a pop out of the exhaust. Looked back and alot of black smoke, like a 18wheeler. It is not smoking or lossing water now. Any way now the motor vibrates hard under accelleration idles ruff. Plug spark is good. They look like they are burning good.

Do these motors jump timming?

In all honesty, it feels like something is out of balance. but not sure what to look for.


I Sorry for not discribing this very well. and thanks any help up front

one more thing I forgot to mention....
if I rev it hard I hear winning or draggin noise as the RPM's fall. it coming from right behind the curve going into the intake.
then I ran across this on you tube
"does it want to stutter when its first started or when u put it in the gear those are common symptoms of your idle air controller going bad"

i reposted this in the 94 tech area. thats where I meant to post.