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I have a 2006 IS350 with about 200k miles. I noticed the car was not firing, I changed the fuel pump, plugs and still no improvement the car burned more fuel, but realised that its a block exhaust I have. It was fixed yesterday and the is so sweet as good as new one.
Is that your precats? I wasn't aware that the IS have precats. Are they in the header? I don't want that in my exhaust or to get sucked back in to my motor. 3rd gen MR2s had this issue and most people gut them or swap the header.
@cleethree: yeah thats the precast even me I dont know it happen we need to that info from Lexus autos
@icy350: getting a new exhaust can help but its not a guarantee that it wont happen again but here in Nigeria we fabricate the free cast which we called indomie with pipes like gun silencer with holes round.