Probably something isn't bolted down well, and the MAF sensors are moving around under load.
As a consequence, you will get MAF sensor misreads, which may be telling the ECU to add too much fuel.
That would correspond with being down on power and blowing out black smoke (i.e., unburnt fuel).
Other possibilities include damaged MAF sensors (unlikely) or a vacuum leak somewhere either before or immediately after the primary O2 (quite possible).
Quote:
Originally Posted by henry0844
I also hear a little pinging below 3000 rpm when I give the car some gas. I noticed it today when my window was down. anybody got any ideas what could b causing this. I checked all intake fittings and they r all secure.
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Whatever is causing the noise (hopefully not actual engine knock...) may be alerting the knock sesnor to pull timing.