Issues with 2011 5.3 silverado
Hello everyone! I have a 2011 silverado 5.3l with 10k miles. I had a magnaflow muffler welded in about 5k miles ago with no issues. Recently i installed a volant cold air intake. When cold outside and truck has not been started in a while, it will start hard and have a hard shaky idle for about 15 seconds then clear up. The exhaust also has a raw gas smell too it with some white smoke untill the engine warms up. If anyone has any input i would really appreciate it.