My 87 Ford Ranger has a continual issue with stumbling, bucking, power loss=
> while driving at any speed, when its cold it doesn't seem to do it, althou=
>gh at startup there seems to be a rough and erratic idle most of the time a=
>nd trying to accelerate doesn't work when its cold. After it warms up duri=
>ng driving trying to accelerate will oftentimes result in the bucking, powe=
>r loss, acting like it isn't getting any fuel. I'm leaning towards a Throt=
>tle Position Sensor (TPS), or the computer (EEC). =20
If the TPS is bad and it's dropped into a limp-home mode, there will be an OBD-I code. See what codes you get first. Then check with a timing light.
--scott