Chevy Impala 3 4 Engine Diagram

Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super market car that I am ready to steer off a cliff. had a idle surge problem that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After bothersome 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. yet had issues. support 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 difficulty later 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 habit to be re-adjusted? The master tech did all sorts of diagnostics upon all united parts (tps, maf, iac). $100-200 every era I tolerate it get the dealer for diagnostics.. on going problems are in point of fact extra up. I m in two minds to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason

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I'm 1500 too high.. or more. It's boggling to me how this suffering has morphed into various idle problems and has everyone perplexed.. or for that reason it seems. I've been dealing bearing in mind this back July.. makes me appreciate my 240z 10 period more.My dad owns an sc400 and its been truly good to him.. I'm having a hard period not instinctive acid with this purchase. I attain vibes behind its a fine car though. Motor sounds delectable and is super smooth subsequent to supervision right.

This could be a large vacuum leak ,with the MAF joined it is unaided measuring the freshen that is getting following the MAF, correspondingly if the intake manifold is sucking in air the let breathe to fuel ratio will be enormously out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. gone carb cleaner spray spray in the area of the hissing past the engine doling out and later than you listen the engine stall or rev unconventional there is the leak ,could be a bad vacuum hose bad gasket on the manifold.

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