I have a 91 mustang All stock. I have runinng problem but it does not do it all the time. heres the deal i just bought this car it is 91 mustang gt w/5speed w/ 92k. it has been setting for almost 2 years. when the car runs good it runs great maybe one of the faster stock mustangs that i have driven. But when starts to act up it will buck u cann't rev it up it will stall. to the point where u cann't drive it. and then other times it seems like it has a lack of power but no other issues. it comes and goes randomly. the ck eng light comes and goes with the problem. i ck it and it pulled a code for the baro sensor. i just don't think that would cause this much of a issue.