Hi All, I posted a previous thread about my stalling / hesitation problem with a Gen4 MAF sensor. I found out that the problem would temporarly go away if I disconnected and reconnected the plug. I took off the sensor and removed the four screws around the plug. After a little wiggle, the plug came out. Inside, there were three leads that were supposed to be soldered to the circuit board inside the sensor. So, if the plug came out at all, it aparently wasn't soldered very well, was it? If you look at the top of the sensor, you will see a flat area about 2 inches square. Around the outside, there is a very well hidden rubber seal. Scrape off the rubber seal and pry open the top of the sensor, exposing the circuit board. SOLDER THE LEADS BACK ON. Reseal the top of the sensor with silicon sealer, reinstall the sensor and POW!... It is fixed! I wonder how many $488.00 MAF sensors have been replaced because of cold or bad solder joints on the inside of that plug! To me, it seems that these solder joints are a weakness in design, as the connections are at a right angle, and subject to failure of this type with vibration, etc... Anyway, it certainly wont hurt to try this first, if you are looking at replacing it anyhow...
One other thing, I started running premium gas and I am getting such better gas milage that it is well worth the difference in price.
-Bill Roman