Definitely check codes:
http://www.toyota-supra.info/forums/...tic-codes.html
And you don't have a MAF. MAF (or Mass Air Flow) is specific to a certain type of air metering system. You have a VAFM (Vane Air Flow Meter) or AFM for short. The GTE uses a KVAFM (Karman Vortex Air Flow Meter)... again AFM for short if you like but you should mention somewhere in your post (or better yet put all of your specs in your signature) whether you have a N/A or turbo. They're all VERY different.