03 dodge ram 1500 4x4

The problem is this. While idling, say at a stop light, you can hear the engine and watch the rpms jumping up and down as if the engine is trying to keep itself from stalling which it will eventually do. While driving (keeping the rpms higher than idle) i have no problems.

Classic vacuum leak symptoms. Is the ‘Check Engine’ light on? There should be codes in the ECM. This may help narrow down the problem.

Yes…the check engine light does come on. A vacumn leak sounds right. Thanks!