I own a 2000 Jeep Wrangler 6Cyl 4.0 automatic. When I am driving down the road my RPM will drop to zero, I push the gas nothing happens. After about 150ft it seems to kick back in gear and I am able to drive again. Also it will completely shut off when idling at a red light or even in park. I was thinking throttle positioning sensor but the jeep runs fine other than rpm dropping. Any ideas of what may be causing this. I am a Jeep enthusiest and cant wait to get it back running right.