when driving ur benz (models with manuel idle) where should you put your idle when driving? i usually have mine at quarter a way from full, and i noticed today that if i move it to halfway the car shifts way better (big difference) so my question is, where should it be????

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76 300D 108,110 miles
99 Saturn sl1 80,000 miles - moms
91 Grand Marquis 45,000 miles - Grandparents
97 Ford F150 - 16,000 miles - Grandparents
73 Ford Monarch (parked 65,000 miles - Grandparents