tps evaluating for ii issues

[SportsterDoc]

Likely possibilities for an intermittent issue:
1. Failing component
2. Poor connection

This is supported by the FSM, page 5-15:

DTC 8-1 (<0.3 vdc) "Loose or poor contact of TP sensor connector. TP sensor or its circuit malfunction"

DTC 8-2 (>4.93 vdc) "TP sensor or its circuit malfunction"

At the beginning of each sensor checking procedure, the FSM admonishes "before starting, check for loose or poor contact..."

I do not want to interfere with your teamwork with Max, Dave, but if the issue is related to the sensor, unplugging it and insuring a good connection, may end the issue.

One more thought: If a poor connection, either incoming 5 vdc power and/or 0.5 to 4.5 vdc output will be lessened. If not out of range, no DTC, but the ECM will think that the throttle is not as far open as it actually is, which would be expected to cause shorter injector pulses, making it lean, which might cause low idle and/or stalling. This should be checked before replacing the TPS.