VX Down and it's Bad

[tjh]

This thread probably should be moved to trouble shooting .

What would cause the Idle to bounce from 500 rpm to 1000 and back again over and over ... when the vehicle is placed into reverse ? It will sometimes do this while in drive . Park and neutral are okay , even with the AC on .
Until now , I have not had any engine problems .

I can guarantee that it's not the driver playing with the accelerator.

[circmand]

This thread probably should be moved to trouble shooting .

What would cause the Idle to bounce from 500 rpm to 1000 and back again over and over ... when the vehicle is placed into reverse ? It will sometimes do this while in drive . Park and neutral are okay , even with the AC on .
Until now , I have not had any engine problems .

I can guarantee that it's not the driver playing with the accelerator.

My 2 most likely options vacuum leak, fuel clog