Bradycardia = too slow. A heart rate of less than 60 beats per minute (BPM) in adults is called bradycardia. What's too slow for you may depend on your age and physical condition. Physically active adults (and athletes) often have a resting heart rate slower than 60 BPM but it doesn't cause problems and is normal for them.
Using technology similar to the Jet PCM, the Jet module provides the ultimate in power tuning. Point-by-point air/fuel, ignition advance, transmission, and various other tuning points provide performance gains and, in some cases, improved fuel economy.
The engine control unit / module (ECM, ECU, or PCM) uses the information that is sent to it from the throttle position sensor, along with input from other sensors, to calculate engine load and control many things such as fuel and ignition timing, as well as automatic transmission shift points.