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How are the plugs?
"When crank times increase due to worn-out ignition components, ie, spark plugs, fuel dilution of the oil causes fumes to collect in the intake and breather systems causing major adaptive requirements, and turning on the MIL...

As with most OBD II vehicles, fuel trim is influenced by inputs from the MAF sensor as well. Any leaks in the intake boot upstream of the MAF can adversely affect fuel mixture, again causing the MIL to illuminate...
But also take a look at the intake ducting itself. The boot is actually hard plastic and is often hardened and easily broken during air filter replacements..."
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