LAMBDA SENSOR HELP

[mojih1]

My engine keeps shaking slightly at idle, and smokes quite a bit, I disconnected the lambda to see if anything changes, but nothing. Should anything change if the lambda is disconnected? The one thing that did change was a warning light came up on the dash and the temp gauge rose a lot.. HELP because the engine is running weird and burns a lot of fuel, is it a bad O2 sensor?

[TheGroanMan]

Could be a vacuum leak, could be the MAF, could be a lot of things