The EGR valve can become clogged with carbon, which causes the Check Engine Light to illuminate. This can result in moderate to severe misfires on acceleration and the EGR valve and passages will need to be cleaned.
1998 Nissan Frontier Problem Reports
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The Check Engine Light may illuminate due to a defective charcoal canister vent control valve. The charcoal canister is a component in the Evaporative emissions (EVAP) system. Our technicians tell us a failed vent valve will require replacement.