MAF sensor replaced, idle still rough

Oh my god. That sucks. My cheapie obd2 scanner says long term fuel trim is 30. So I bought a smoke machine and did a leak test. No leak. I took it to a mechanic and he did the big obd2 sensor scan and test drove it and checked it all out and said there was absolutely no problem. Still has rough idle. Sounds like I just bought a bad car. Yikes!

Hi there, I had the same issue with my truck and stopped when I upgraded to premium fuel, is worth trying…

I believe that I have gotten confused while reading this thread. What exact problem are you trying to solve here? The symptom of “running rough” and MAF do not go hand in hand I’m sorry to say. Also your use of Propane to find leaks thus far is null and void as you arent using it in the proper manner. Propane is used to find vacume leaks that are after the throttle plate… not before it in the air ducting leading to the throttle body.

Please describe “running rough” is it an engine miss you are talking about? Is it the idle speed you are discussing? Please elaborate…and never…EVER get repair advice from Auto parts stores, unless you know the person to be a competent automotive guy or a former mechanic.