02WS6FREEBIRD

iTrader: (4)

I have been tuning the car in OL with a AEM WB and have the VE done and getting real close with the MAF table, finished a scan today, filled up the gas tank, drove home and tweaked the MAF, uploaded tune and now the car starts hard, doesn't idle well and the WB shows the AFR being around 16 to 18 and off the scale and at that point I noticed it smoking, kinda grey/white smoke...what just happened? It's been running real well, I put the previous tune back in...did the same thing, no bubbles on the oil dipstick or in the radiator, hope I did not screw up my engine, but something made it go lean when the revs get up to about 1500 rpm the AFR gets better to around 15-16 still lean, could it be the fuel pump? it's a 2002 with 22,000 miles only on it.
Thanks for any suggestions.