2007 Ford edge low idle mass air flow sensor is good replace the air filter no vacuum leaks I'm possibly thinking it could be the throttle body

SOURCE: buick lesabre nightmare 2

• The PCM doesn't even see the O2 sensor until engine temp has reached operating temp,the vehicle goes from open loop when cold,to closed loop when warm,where the PCM uses the O2 sensor to measure the rich/lean of the exhaust content,and from that,adjust fuel richness to achieve 14.7 to 1 air/fuel ratio.So when cold,the O2 sensor is out of the picture anyways.When unplugging sensors,it can be deceitful.The PCM has a program whereas,if a critical sensor (such as the mass air flow) is somehow damaged and out of the picture,the PCM will substitue a generic value that will allow the engine to stay running.So,by unplugging the MAF,it did try to run on it's own better than plugged in,there's the problem area.The vehicle is running better with the MAF unplugged,because the MAF is likely bad,and the PCM is substituting it's generic value when it IS unplugged.Something to recheckThe PROM update is a newer program for the PCM,and likely won't fix it unless the PCM is bad.I would try a good used PCM as a last or later resort,because i have seen my fair share of defective PCM's too.I have taken some PCM's apart,and found capacitors that had gone bad and leaked all over the circuit board,mostly Honda and Mitsubishi and Chrysler though.Good luck,keep me posted.

SOURCE: 2001 toyota celica vaccum leak, po171 keeps comingon

problem is most likely your purge canister itself.

SOURCE: 1993 toyota 4x4 idle problem

sounds like your throttle positioning sensor is not set right so i would undo the two phillips heads that hold it and turn it till the idle doesnt fluctuate should be turned most of the way to the front of the truck. Also check your idle screw that throttle body could be set different.

SOURCE: 2001 ford explorer sport does not idle when cold

If engine is actually running lean,could be clogged fuel filter or weak fuel pump.

SOURCE: 2003 CHEV AVALANCHE 5.3 HAVE

Hello' With carburetor cleaner check for vacuum leaks around the rubber hoses coming off the intake manifold. Check for leaks at the intake manifold where it mounts to the engine. If engine speeds up when you spray that means you have a vacuum leak.