I had a similar problem in my 2000 GTS 6 speed. I fought with this problem for almost 2 years. When I would step on the gas, the RPM's would drop and then the car would come to life about 2 seconds later. It was horrible because to keep myself from stalling when starting out, i had to give it massive gas and then my I would burn tire. I cleaned my MAF the other day because I was at my wit's ends and couldn't think of what else to do. Mind you, this is after the dealership told me that it was more than likely a major engine problem. To make a long story short...after cleaning my MAF, the car works fine. It no longer does that stupid stuff. Funny...I was ready to sell it because I thought that it was a major problem. Hope this helps!