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Re: What should I do for a tune-up for '86 F250?
Hello & Welcome
I would change the plugs, cap, rotor & possibily the plug wires. Along with the oil, I'd replace the fuel filter, air filter and check the PCV valve.
Might also have a look at the radiator hoses. When cold, squeeze the hoses, if they feel crunchy or brittle, they need replacing.
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