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Question:

I have a 1999 Toyota 4Runner with the 6 cyl. When the engine heats up it runs real rough and the engine light comes on (almost like it was running on 5 cyl.) It feels like it will stall when you come to a stop and it shakes bad. Also has no power when in overdrive unless I hit the gas hard. When I rev the engine it seems to sound great but when the rpm”s drop it runs rough again. I replaced the fuel filter, air filter and plugs. But it still runs rough when hot? 

Answer:

Remove the Spark Plugs and verify the vehicle has the correct Spark Plugs installed. The engine requires the use of dual ground electrode Spark Plugs. If the incorrect Spark Plugs are installed, the vehicle can run poor and can set misfire codes. Always install the correct dual electrode Nippondenso Spark Plugs # K16TR11 or NGK spark plugs # BKR5EKB-11. Then test drive and verify the engine misfire has been repaired. They also have a lot of MAF sensor problems that is the most common fault. Use a Scan Tool to determine if you have any existing odes. 

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