Is there a computer that stores my truck engine info and programs different engine settings?
Look up ODBII. Depending on the age of your vehicle, there should be an ODBII connector under the dash somewhere. You can get the cable & software on ebay, all you need then is a laptop. What can be done depends on the software and your truck. Most OSBII softare can view engine performance data, show many sensor readings & graph & store it. Also they will show you the engine codes. Some software can change settings. You would need to look at the software’s capabilities.