And now, again, it appears to be sticking. What am I doing wrong? What do I need to do?

__________________
14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 163k miles
06 E320 CDI "Rutherford", Black on Tan, 182k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 147k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 82k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife