Engine 1989 5.0 Lx Rough Idle. Need Help Pls

Discussion in 'Fox 5.0 Mustang Tech' started by Jean-Francois, May 23, 2013.

  1. I have an 89 mustang lx and the problem I'm having is as follows:

    Rough idle--searches for idle from 600-1000 rpm.
    Stumbles under acceleration. Feels like its missing.

    My car is mostly stock but I put 24lbs injectors cause I have to replaced the old one and I thaugh thats gonna be a good idea to upgrade to a bit higher. After all I found my car less powerfull and burn out the o2 sensors, so I changed the o2 and the MAF sensor (BBK 24lbs pre-set). Power is back but the car won't run great on idle or when is got no load. I've been chassing the problem for a while but I need Help.


  2. check the "surge idle checklist" made by jrichker. All your answers are there.

    I had three Doritos Tacos for lunch today. Damn they were good.
  3. I look for codes and nothing than I re-adjust the TPS at .9 volts and than reset the computer. No change at all.
  4. Thanks I'll try it.