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If it is still sputtering, it is important that you take it to a mechanic to have it checked.It is possible that you did not change it well. Take it to a professional mechanic if you are not one.
Standard antifreeze should be changed every two years. Long life antifreeze needs changing every five years.
Probably need a new Fuel Filter. When was last time it was changed?
It depend's on what type and year vehicle you are driving. some of the gm model's have a lifetime antifreeze that is orange in color.
It is overdue to be changed.
Was it missing and sputtering before you changed them? If no, then you could have got the firing order mixed on the distributor. Maybe if you didn't replace the wires also one became more damaged while removing it. If yes, maybe its your fuel, or injectors, and you need to add a bottle of cleaner to your gas tank.
because he changed his goal
check your oil to see if you have coolant in it. if you do your intake gasket needs changed.
because you probaly changed it with the wrong water
I am no mechanic but i just had my ignition coils changed on my ford expedition and there are 8 it was expensive to fix .
The color of the antifreeze does not matter, as long as its the same type used to fill it the last time you changed it. I would suggest using the "long life or extended life antifreeze. this is good for around 2-3 years. You can buy the cheaper stuff, but it must be changed more often. But again, the color does not matter.
If it requires a timing belt it probably is but not all engines have belts. The Expedition uses a timing chain. It doesn't have to be changed as part of a schedule like a timing belt.