Take it to a trained professional.
Could be a number of things... bad air filter, fouled spark plugs, weak fuel pump...
Have you checked your spark plugs, spark plug wires, destributor cap and rotor, do you have dirty fuel injectors. It could be any one of these seperatly or a combination of any or all of these. Then it could be your magnetic pickup in the distributor or your engine control module. You need to test all these components to know that they are the problem. If you just start changing parts it can get expensive.
1 - 3 - 7 - 2 - 6 - 5 - 4 - 8 Coil On Plug ( C.O.P. ) ignition system The engine cylinders / spark plugs are numbered : 4 - 8 3 - 7 2 - 6 1 - 5 front
The thermostat on a 1993 Ford e 350 7.3 diesel is located on the side of the engine. The thermostat can be found by following the upper radiator hose.
With regular maintenance inluding oil changes, air filters, plugs wires etc. there is no reason to expect that it will not reach 250K
glowe plugs on 1996 ford e350 .7.3 diesel are under valve cover
My 2000 E350 has 385 978miles keep the oil changed
2007 mercedes e350 uses 5w 40 engine oil
how many quarts in a oil change 2007 mercedes e350