I recently replaced my spark plugs and cleaned both cam position sensors however I continue to have an occasional stumble at idle. Don't get me wrong the spark plugs and cam sensors cleanings helped smooth things out, but there continues to be a "rough" idle every other stop light that is annoying me.

Next thing I want to replace are the coil packs (part number 90919-A2005), does everyone here replace them ($90 each lexus part ) or has anyone used the Denso Toyota part that are $100 for all 6?

 

I purchased these within the past 6 months. Cheaper than stock, and do the job. Hard to measure any performance gains since I installed them in conjunction with my PPE headers; but they work well.

https://www.holley.com/products/igni...parts/140630-6

https://www.clublexus.com/forums/per...ore-power.html

 

I went with Toyota Branded Denso plugs off ebay (same part number as the lexus plugs), all 6 for $100 shipped. I'll be sure to report back how they do.

 

I get the occasional stumble at idle on my 350 do you guys have a link to this cam sensor cleaning?

 

^Basically you have four of these sensors. You remove them, care of one 10mm bolt I believe for each, and just clean the ends using something like CRC QD Electronic cleaner. I believe you are referencing the cam position sensors, yes?

 

Sounds like it to me, I'll give it a shot as it's a quick job on the 350.

 

How long has it been since you've reset the ecu? I usually do it once in-between the winter season and summer; and of course again going into winter and so on.