Mga gurus,

my kia sedona is experiencing rough idling at cold start. But after you rev the engine, in a few seconds the idling normalizes. Kia already replaced the injection pump. The pump was replaced for a different problem. This rough idling happened after the pump was replaced. I sent it back to them, they just bled the priming pump. But every morning, the problem is still there. What could be the cause of this rough idling?