sounds like limp mode to me...check to make sure your maf didnt blow out and then kill your ecu...thats what happend to mine, took the dealer a **** long time to figure it out. and cost a pretty penny at that...but definatly sounds like what mine was doing when i still had the car...
i have b15 ecu for sale if thats the case that you would need one and i also have a newer b15 maf...pm me if your interested
i have b15 ecu for sale if thats the case that you would need one and i also have a newer b15 maf...pm me if your interested