Rushore

Hey Folks, not sure if anyone else experienced this but when I'm driving at Highway speeds, if I let go of the accelerator to coast and then reapply the accelerator, I get a jerking, bucking sensation. It's only at high speeds over 60 mph or so. I'm only coasting for a second or two, not long at all.

Otherwise the transmission works well. Any advice would be greatly appreciated

Rushore

It looks like it occurs only when I have the ac on so most likely not a transmission issue...

bigboss

In this situation, spark plugs is usually the problem.

litzdog911

What year RX330 do you have? How many miles?

nedogre20

I have an 04 Rx330 with 133k miles and recently changed my spark plugs but did not experience what the OP was describing. Here is a pic of what a few of my spark plugs looked like compared to the new one.

Rushore

I have a 2005 awd with 126k miles. I bought it used last year and had no issues so far.

So how much would replacing the spark plugs run? Not sure if mine were ever replaced.

Thank you all for your replies.

nedogre20

I bought my spark plugs from autozone NGK which came pre-gapped. I bought the plenum gasket and pcv valve from toyota. While I was in there, I went ahead and did the thermostat because it was leaking. I would say I spent around $120 for the spark plugs, pcv valve and plenum gasket. If you're valve covers are leaking, this would be the ideal time to change out the rear valve cover gasket. I called my local toyota dealership and they wanted $350 +tax just for the spark plugs.

Rushore

So with the new spark plugs did you notice better engine performance, gas mileage?

nedogre20

Nope. After all the maintenance I haven't seen any increase in gas mileage or anything else for that matter. Drives smooth as ever with the new Michelin tires I just put on. Its like a brand new car again