t2 wont rev down
 

well today i changed my water pump and once i was done i went to start my car and as usual it revs to 2000 for a few seconds when its a cool engine .. then it comes back down too 750 rmp...but it didnt...and it pissin me off..no cables r stuck or anything..and when i rev it up highter it just stays there and wont move....my car is a stock 87 t2 with just a intake and thats it...
need help i kno some has gone through this before me and i want to kno what u did


thanks