When i start my 95 mustang 5.0 it idles like crap ( rpms go up and down)for a min. or so then the check engine light comes on, then the car idles fine.. i can drive it around after that with no more idling problems even with the check engine light on. it just does it on start up. the motor had some work done to it like cam,heads intake and so on.. do you guys think that i need to get it tuned to make it run good without it idling rough on start up? Im not sure if the guy i got it from did any kind of tune or anything.
