hi guys, in the past days my 89 fj62 are in the range of 1000-1100 rpm in P or N; then i read a few post in here and take the throttle body off to make a clean job, theres a lot of builup, when i finish i put all the stuff on and turn on the engine, after a few minutes the rpm go down to 650-700!!, but when i press the gas pedal the engine revs go only at 2000 and then cut acceleration and when reach the 1500 rpm go up to the 2000 rpm and then cut the acceleration to the 1500 and then go up to the 2000 ALL THE TIME!!! what i do wrong??????