cyndi junkersfeld

have been trying to figure this out for months when slowing for curve or up hill shuttering i think kicking itself out of overdrive so if i push o-d off rpm goes up but otherwise shutter or hiccup computer says low idle..some people say throttle body we cleaned it we changed spark plugs some people say torque converter...help driving me crazy

2005 f150 4x4 triton 5.4 v8