Hey guys new to this forum. Im looking for a little help i nust bought an 86 f250 7.5l. I changed the egr cap and rotor spark plugs and wires oh and fuel filter. It ran great passed smog great truck till a weak later. When i started the truck it has high rpms 1000 to 1500 but when i put it drive it dropes down to 600 rps loses power and shakes like crazy. And then when you go to drive it it has no power it will drive but it just takes awhile to get to speed iv gotten it ro 75 mph but it took a while. So i need aome help here any help souls be highly appreciated. Thanks