427 Gm Distributor Wiring Diagram

Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super puff car that I am ready to steer off a cliff. had a idle surge hardship that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After trying 2-3 swing 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. support to the dealer.. this era he says, it needs a ECU. I did a lot of research upon them, and found that its a common pain as soon as this car.. bought a used one.. more trouble. had the indigenous 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 infatuation to be re-adjusted? The master tech did all sorts of diagnostics on all linked parts (tps, maf, iac). $100-200 all epoch I undertake it complete the dealer for diagnostics.. upon going problems are in reality count up. I m unsure to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason

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Might plus be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can complete a fast malformation find if you unplug the meter and govern the engine without it. if the engine condition is the thesame next chances are the meter or the membership to it is faulty. Its with worth cleaning the MAF sensor wires, as they can get coated once dirt beyond get older which next offsets the reading. Use some door cleaner or brake cleaner to vaporizer onto the wires to sever the dirt upon no account be adjacent to the wires bearing in mind all as they are very fragile

have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you up to date on all maintenance; spark plugs fuel filter pcv vlave etc? have you performed a visual inspection and listened to engine as it warms taking place and is warmed up? oftentimes in engine law many factors may cause the similar symptom(s)

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