Ive had a Idle problem with my 99VX for about a year now. The isuzu dealer was no help buy my local mechanic was able to shine some light on it. My engine will idle around 2800 RPM's, and as you know changing from drive to park and so on sounds like the transmission is about to fall out. My mechanic found out that if you take off the neg. cable on the battery for over 10 min. the problem goes away and it idles down. This seems to work for about a week and then it slowly starts to rise again. My mechanic tells me that the computer is going bad and that it thinks it is in a very cold place...but in reality its in Tennessee! Can anyone help me out??

Thanks...