Warm and Idling= SVC Engine Light ('95 Chevy Tahoe)

[DeeJ]

My Tahoe svc engine light comes on when the vehicle is warm, and has been idling for a while (Several minutes, the warmer it is the less time it takes). It doesn't come on at all until the vehicle is warm.

When I rev the motor and/or shift, it disappears not to be seen again until I am parked and idling. So... What's causing this? Best course of action?

Thanks.

[Jeremy airjer W]

Scan it and see what codes are present. Without knowing the codes the possibilities are endless.