I have white smoke coming out my muffler and my car keeps slowing down

Hello, white smoke could be an evidence of condensation in the exhaust system, or could be evidence of oil consumption concern (more blue-white), or could be evidence of an internal engine coolant leak. The color and presence of smoke alone is not enough to obtain good diagnostic results. You'll need to have some testing performed with the engine to find out what is happening causing the performance issue, and in turn the smoke. www.repairpal.com/repair-shops