My 83 Celica GTS 5 speed is cutting out at around 3600rpm's. If I stay on the throttle it will continue to decelerate until I release and re-apply. If I disconnect the battery for a while it will run fine for around 200 miles then it starts again. I have done new positive terminal, new ground wire to battery, cap, rotor, wires, plugs, and a PCV valve to try and stop this to no success. I do not have a check engine light coming on. Can anyone help me on this? I stumped and I'm not getting any help in the Celica forum. Thanks in advance for any help.