Why does your old engine make no power?
Why do old engines not make as much as when they were new? Unless it’s a 5.3 those somehow get more powerful over time. If you have a high mile engine the loss of power could be caused by countless things, depending on some of the symptoms you can start checking to get it back up to stock power. Sometimes you feel it sometimes you just know it’s there making you lose races or just giving you worse reliability and fuel economy.