Welcome aboard fella, could be a dodgy Maf, there is a diagnostics you can do on it, under the drivers side of the dash there are 4 plugs, 2 green and 2 black, they will all be unplugged, plug the 2 black together and turn the ignition on, watch the check engine light and note the flashes it does, there is a full write up on it on the net, I think on scoobypedia but I'm not at the laptop right now so hopefully someone else will be along that knows for sure