All Vroom And No Boom !

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Have you made any changes? Wheels/tires? I had a friend who added new wheels/tires on his car.....and they were over 20lbs heavier on the rear than the stock wheels/tires. This unsprung rotational mass mad his car slower.

There are other things, and you could just need a basic tune-up. Filters, plugs, etc. Do you also have a lady on the hood? That could be 100+lbs of added weight slowing it down........
 
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Have you made any changes? Wheels/tires? I had a friend who added new wheels/tires on his car.....and they were over 20lbs heavier on the rear than the stock wheels/tires. This unsprung rotational mass mad his car slower.

There are other things, and you could just need a basic tune-up. Filters, plugs, etc. Do you also have a lady on the hood? That could be 100+lbs of added weight slowing it down........
 
Does the engine sound any different? lower pitched? when your at a stop light does the engine seem to run a little rougher? it could be some cylinders are misfiring.
 
Welcome to factory Horsepower & Torque, time to start modding! That or the vehicle is in need of a tune-up or other such maintenance. We can't push you in the right direction without more details, your statement/question was entirely too general.
 
Have you made any changes? Wheels/tires? I had a friend who added new wheels/tires on his car.....and they were over 20lbs heavier on the rear than the stock wheels/tires. This unsprung rotational mass mad his car slower.

There are other things, and you could just need a basic tune-up. Filters, plugs, etc. Do you also have a lady on the hood? That could be 100+lbs of added weight slowing it down........
 
What year and what model Mustang? V8? V6? How many miles? How long have you had it? Did it just suddenly feel like a loss of power or did it kinda happen over the course of some time?