ThunderMax Electrical Issues - Marelli and Early Delphi Systems - Manual (Page 3)

Through monitoring of gauges in the SmartLink software, we have
discovered abnormal readings for throttle position, manifold air
temp and erratic IAC movement. These will lead to poor
performance, poor idle quality or abnormal fuel delivery. These
conditions may be intermittent. Wires may be down to a few
strands, broken inside the plastic coating, or broken at the terminal
in the connector, resulting in intermittent or, eventually, no contact.
Troubleshooting this type of issue can be very time consuming and
costly. Some technicians have reported changing results by grabbing,
shifting or pulling on engine harness wires. A more accurate method
would be to remove the pins from each TB sensor plug and locate
damaged or broken wire in the harness. A common technique is to
remove the pin from the sensor, and the damaged wire could pull right
out of the harness. This will require repair or replacement to the EFI
engine harness.