Chevrolet Engine Vacuum Routing Diagrams

Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super present car that I am ready to drive off a cliff. had a idle surge difficulty that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After bothersome 2-3 vary used IAC s, I took it to the master tech at lexus. He said it was the IAC valve. He tried my used ones.. and finally a rebuilt one. yet had issues. help to the dealer.. this times he says, it needs a ECU. I did a lot of research on them, and found that its a common problem in the manner of this car.. bought a used one.. more trouble. had the original one rebuilt by a specialist.. and that s where I am at now.. Put it in tonight and the car idles at 2k rpm. Does the TPS obsession to be re-adjusted? The master tech did all sorts of diagnostics on all aligned parts (tps, maf, iac). $100-200 all become old I resign yourself to it reach the dealer for diagnostics.. upon going problems are in reality adding up. I m of two minds to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason

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I started the car up this morning, it starts stirring and runs at 1750 and within a minute or in view of that climbs over 2500.. It is organization serene though, just pretension forward-thinking than it should be. I also checked the throttle screw plate/return screw, deliberately turned it out and nothing changed. put it back to exactly where it was. No vacuum leak sounds and all contacts verified. I character fine about them as I've been in there a bunch of times..

I don't have any check engine lights unless I unplug the MAF sensor. next the MAF is plugged in after that the car will stall unless I put my foot on the accelerator. There is furthermore an intermittent popping sealed coming at idle.

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