I have a ford escape 2002 v6 it stumbles and gives me code p0302 ,i changed cops,sparq plugs the most basic i tested egr valve vacum ,when i put vacumm it idles an almost stalls. but when i hold the vacum it does not hold it,it stumbles with the hose on or off i tested all egr components but cabt find the culprit,i know for sure theres a vacum leak,when its cold it idles a little rough ,but when weather is warm it idles perfect and stumbles less.
 
Model: ford escape
Year: 2002
What have you tried so far?: Egr component testing vacum and circuit