Nau

About the plugs - what BRAND (aside from Toyota - is it NGK by the way?) is good for our Lexus?

pre-gapped or not, I always check them. You never know what happened in the store room, in transit or with the initial gapping.

I don't trust blind faith and it only takes a second to check.

steviej

Right on, Steve!

My EGR went last year at 72K miles. Did the weird ideling and stalling.

So what was wrong?

Also check the tube connected to the egr valve.  Sometimes it plugs up with carbon deposits which can get pretty thick thus restricting vacuum the the egr valve. The carbon needs to be throughly cleaned out otherwise the check engine light will continue to come on & off.

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Thanks for your advice guys!

I'll do that.

Also I forgot to metion that idle RPM behaves strange:

Say I stop at traffic light, idle can be at 1200, and go down to 700-800 in 1-2 mins. Or it can go right down to 700-800. Is it related to EGR problems?

Car has 158K on it...

Thanks again!

A week ago check engine lighted up on my '90 ES250. It was on for two days, then turned off by itself.

Code showed was 71 - EGR, right? (Sorry. I don't have a manual :(( )

I tried to suck on the tube which goes into valve, it opens/closes just fine, the hoses which I can see from the top look good.

I get also quite a lousy mileage - 17-18 city MPG and 23 highway.

Tune-up 2K ago.

What should I look into? Thanks!