Question about 1989 Ford Mustang
Sounds to me that you have some sort of blockage in the valvetrain. I would probably try and flush it and see if that might help the problem. My wife has a 89 5.0 LX and it was doing some simular stuff after I changed the trans. so I flushed it twice and dropped the pan and changed the filter and gasket afterwards. I flushed it first so that everything would get caught in the old filter and then changed the filter. Her's is better now. When and if you decide to try this, I used a trans. cleaner that was ran in the car for about 10 to 15 minutes. It was supposed to breakdown any buildup. Then we started the flushing process, we flushed it twice because it was still a little dark after the first time. I hope this helps
Posted on Apr 08, 2009
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Posted on Jan 02, 2017
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