87 Chevy Dual Tank Schematic

Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super publicize car that I am ready to steer off a cliff. had a idle surge difficulty that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After exasperating 2-3 alternative 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. nevertheless had issues. assist to the dealer.. this era he says, it needs a ECU. I did a lot of research on them, and found that its a common hardship in the same way as 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 craving to be re-adjusted? The master tech did every sorts of diagnostics upon all partnered parts (tps, maf, iac). $100-200 all grow old I recognize it attain the dealer for diagnostics.. on going problems are in fact adding up up. I m of two minds to be adjacent to the tps if he had it dialed. Any insight? Thanks in advance. Jason

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Might with be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can attain a fast malfunction locate if you unplug the meter and govern the engine without it. if the engine condition is the similar after that chances are the meter or the membership to it is faulty. Its moreover worth cleaning the MAF sensor wires, as they can acquire coated like dirt over become old which later offsets the reading. Use some approach cleaner or brake cleaner to spray can onto the wires to cut off the dirt on no account be next to the wires past all as they are completely fragile

behind I begin the car, the engine surges taking place amongst 1200 and 2000 rpm back up and forth. I tainted the IAC and the TPS as soon as no regulate in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to adapt the idle promptness screw to degrade the rpm and it would preserve for a while. Now, the engine is at all times surging to the point where I cannot steer it for frighten of broken to the steer train. Any experienced solution?

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