1991 Camaro 5.7L TPI has hesitation under load. Solution: Log Mode 22 data during a test drive. The log shows the knock sensor pulling 8-10° of timing at 2500 RPM, but there is no audible knock. Replace the knock sensor (false triggering due to a loose torque converter bolt).
While Terry’s original tool remains beloved for its simplicity and low cost (often free), modern alternatives exist: gm mode 22 scan tool by terry
: It enables users to view proprietary sensor data that generic tools might miss, such as specific transmission temperatures, ABS data, or body control module (BCM) status. Functionality Comparison 1991 Camaro 5