1997 Ford expedition with 5.4 V8, replaced spark plugs & continue to have intrermittent missing. Missing from moderat to severe. Acts up more in rain, but not alwys, is it coil pak or injector. Ran a number of cans of injector cleaner without success. What is solution?
Hello, I'm Chris, a current Ford Lincoln Mercury employee.
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This is most likely a faulty coil on plug. You will need to use a scan tool to see which cylinder is misfireing so you will know which of the 8 coils to replace. Rain and air moisture can affect the coils and cause them to arc out and not give current to the plugs.