2012 roadster, Ramair, Tors, 20355 tune. New vacuum hoses, good plug wires, iridium plugs, new fuel filter, balanced maps, checked and quadruple checked tps voltages. 😮💨
Ran a 15 min tune (sounded good), TOUCHED NOTHING, and suddenly the throttle percent bounced between 0.8, 1.2 and 2.7, engine...