last night my 98 blazer 4x4 was acting up out of no where drove from work fine then went to go to the drive thru and at a stop light rpms jump down to 200 rpm and jump back up to normal idle then high idle and when i went to take off acted like it wanted to just bogg down and die. thought it was my fuel pump due to my fuel gauge not reading properly. so while it was runing and trying to die i poped the hood and heard a loud vacum leak weird never had that before so i traced and found that the connector to my pvc valve came un hooked some how lol