Idles @ 1000 in park and neutral. Goes to about 750 in drive only when car is moving. As soon as wheels stop turning, idle speed goes back to 1000, with car in drive. Any tips? Changed ism, vacuum steady @ 18psi. Fuel trim levels are negative -39. Fuel pressure at 48 psi. Signs point to rich condition, but can’t seem to locate problem. Any ideas? Also getting p0705 , transmission code pointing to nss. Don’t know if that has anything to do with problem.