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Old 12-10-2014, 03:52 PM   #1
Join Date: Dec 2014
Vehicle: 1989 mustang lx 5.0
Location: South Carolina
Posts: 1
Default Please help

I have an 89 mustang 5.0 manual. Here recently it's been losing power. When I crank it, it idles fine, even if I rev it. Once I actually get moving it is sputtering. If I accele slowly it will move a little better. If I hold it wide open it backfires sometimes but will not go any faster. I changed fuel pump, filter , cleaned out mad and tps. Any help please
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Old 12-10-2014, 04:12 PM   #2
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Vehicle: 1990 lx hatch 5.0
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KOEO/KOER check for codes.
Check fuel pressure at the rail
When was the last time the car had a full tune up ? Plugs wires cap rotor air filter ?

It could be a faulty coil, faulty TFI module, faulty PIP.

Last edited by dawson1112; 12-11-2014 at 03:28 PM.
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Old 12-11-2014, 08:18 AM   #3
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Welcome to the forum, if you don't know what dawson is talking about, use the search feature and do a little reading. There's a ton of info on this site to dig thru and it's all been covered before. Good luck
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Old 12-15-2014, 02:53 AM   #4
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Like daswon said. Sounds like your dizzy might be the issue. I had this problem before. Bad pip more likely. Word of advice, if you do buy a new dizzy make sure its new NOT a rebuilt/remand. They are garbage.
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Old 12-25-2014, 02:40 AM   #5
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Mass air sensor dirty or needs replacing.
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