My starter isn't engaging while on vehicle, but it is spinning?

When I take the starter off, It does engage when I jump start it. The truck is a 1986 Ford Bronco. 5.0 Motor. I've tried putting a new ground from the battery to the engine. I also took the starter autozone and they tested it and said it was good. Any advice is appreciated.

1995 ford bronco trains troubles?

I recently bought a 1995 ford bronco. Now the trans has been shifting really hard into every gear and even down shifts hard. It doesn't have this problem every time but when it is doing it you know. Also when the bronco starts to shift real hard the overdrive switch on the shifter will have a flashing off light. When I try to press the switch it doesn't do anything. I don't know much about transmissions and have no idea what is causing the truck to shift hard. So if someone knows what is going on if you could please tell me, Thanks

Truck lurches and knocks?

I have a 1991 Ford Bronco XLT 5.8L V8 with an automatic transmission. When I accelerate from a stop the truck lurches forward as if the gears are slipping in the transmission. It doesn't do this every time and when it doesn't it makes a knocking sound once I hit about 20 mph. Any ideas?

Loss of power at high speed?

High, I have a 94 ford bronco 351w (5.8) and I lose power at high speeds! 3rd and overdrive is when it happens. My rpms drop to about 1000 and I can't speed up as fast as I used to!

Why does my engine bog down when I give it gas?

I have a 1985 Ford Bronco Custom 5.8 liter V8 w/ carburetor. I have to give it gas once I start it to keep it going for a minute. Also when I give it to much gas it bogs way down and almost dies. It has a new fuel filter and has a brand new timing chain that was set in place. What else could it be?