Hey, i own a 98 4runner 2.7L 3rzfe , the engine seems to be getting a little slugish when idling, not sure if its a misfire on the spark plugs or my wires.... runs decent when driving just when it idles seems a little rough.... if anyone knows any thing i could try that would be great thanks... i do know know that one of my wires was missing a rubber piece on the inside where it hooks up to the plug?? I have the new wires ordered..

 

uhh, do a tune up, then turbo that bad boy and report back. the 3rz's hold boost well.

 

it could be alot of things i would see if the plug wires solves your issue first

 

What would you guys consider a good tune up? Things that are know with this engine? Thanks

 

change the oil do the air filter maybe change the spark plugs, check the fuel rail for leaks, mine leaked. your timing may have jumped so a timing chain, you might need new coils. it could be alot of things

 

air filter is clean, oil was done not too long ago...i just changed the plugs with NgK platinums(which one are you guys running? .43 gap or .32 gap?Brand? Wires are my next purchase NGK's

 

ive never changed the plugs in my runner and i have just over 200,000 miles

 

I did a swap into my '84, rebuilt the 3RZ, of course new plugs, and pulled them after 25K miles. They had pretty rounded electrodes so I replaced them. 200K on OE plugs is impressive...

OP, I would check throttle body for being gummed up. Idle air controller as well. And I have heard, not experienced, that the valves being out of adjustment can cause a rough idle.