Any help?
my nissan exalta GS ave a RPM problem. it started when i overhauled the radiator! the prob is when it goes to Drive shift the RPM abruptly down to 650:

P:N = 850 RPM
D = sudden 650 RPM
engine start = up to 1100 RPM then back to 850
AC on = RPM does not change

i already send it to the mechanic and cleaned the throttle, the problem still exist

any help please!!!