2001 Nissan Pulsar • 4 cylinder 2WD Manual • 157,000 miles

Hi I have nissa pulsar 2001 lx, it has a problem with rpm its always higher than 1.5 never come down I try with mechanic and he can't adjust it, the main problem is when I put any gear to drive the rpm always go up and come down. I try with lot of mechanic no body can find the prob. Some one soy need to change the all wires and computer, some one say it suck the from some where. But no body find the problem. What should I do, one of mechanic try with new computer and wires but no solution please advise me what to do urgently thanks
March 19, 2011.

Was the AACV checkd/replaced?

Did you test for vacuum leakages?

Was the throttle body checked?

Jun 14, 2011.