[darkpuppet]

try unplugging your MAF and see if it runs the same craptasticness.

if so, you can check the continuity of the MAF by testing continuity of each pair of pins (2 outer, 2 inner, etc..)... should be some resistance, but nothing too crazy. I can't remember what I got out of my stock MAF when I tested it, but if I can get my multimeter back, I'll test it again and let you know.

if the car drives the same without the MAF plugged in and the MAF turns out fine, then it could be a wiring issue... which cost me about $500 to fix.

Also, the dealership noticed that my fuel trims were EXTREME, maxing out at 25% at times (it should have thrown a cel, but with a custom tune, it doesn't for some reason)...

so if the MAF checks out, and the wiring checks out, try resetting your trims... you car may have picked up bad habbits from somewhere... and then checking to see if they go extreme again. Is your MAF in the stock housing? putting it in an aftermarket housing like AEM that is slightly larger could cause your learned fuel trims to top out, leading to the car running in open loop all the time for craptastic performance.

hope that helps.