alright lets get started here i have a 1994 mustang 3.8 liter well when ever i take off my car has no power at all and when i reve up the engine its sluggesh and then gets power but sometimes backfires threw the air filter i have changed spark plugs spark plug wires air filter fuel filter egr valve about to change the fuel pump is there anything anyone might think of that is easy to change before i have to drop my tank that might be the problem thanks everyone