Fortunately, the 4.0L SOHC is not an interference engine so a timing chain failure won't bend the valves.
The TSB concerning the intake and exhaust valves (Ford TSB No. 02-3-2) applies to the 4.0L SOHC engine only (SOHC and DOHC 4.0L engines were offered during the 2000 model year). Affected vehicles set a DTC P0300 or P0301. The misfire must occur at an engine speed greater than 4800 rpm (consult the freeze frame data). This type of misfire (and the resulting DTC occurs under heavy acceleration because the exhaust valves may hang open slightly.
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