1999 Ford Mustang 3.8


Asked by Feb 26, 2016 at 04:23 PM about the 1999 Ford Mustang Coupe

Question type: Maintenance & Repair

It seems at low speed my car randomly decides to shut down some cylinders or feels that way.  Car loses power you can push the pedal on the floor and get slow acceleration.  I have changed the plugs, wires, coil pack.  When you shut the car off and restart it all is fine for the first couple minutes or seconds depending.  This has got me really confused hopefully someone can help.  Also when this happens the car begins to idle really rough someone that was listening to the car when this happened I gunned the gas and they noticed that a soot type cloud came out the exhaust.

4 Answers


Sounds like your vehicle just needs a good cleaning and blowing out. First check air filter and replace if necessary clean throttle with throttle body cleaner change fuel filter if have not done so in a while add fuel injector cleaner to gas tank and take vehicle out on the road and hit the passing gear a few times this will blow out the gum and carbon build up in the engine.


Forgot to mention air filter is new and have also cleaned the throttle body. Have also ran injector cleaners as well. The issue happened a few months back I changed the plugs, wires, coil pack and all seemed good then today the issue started happening all over again. Its giving me a headache lol


Have you changed the fuel filter ?


This is one thing that I have not none. When you nail the gas you get some black smoke as well but only when putting it on the floor almost like its getting to much fuel in the engine.

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