2002 Buick Lesabre Engine Diagram

Hello, I have repaired on top of 30000 vehicles in my career and I habit to question you questions past I am not there in person to gather facts, data, or to test your vehicle. I may question you to take effect assay in my stead. If examination is needed and you would rather not function testing, I can manage to pay for my best advice, Fuel pressure?

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I started the car going on this morning, it starts occurring and runs at 1750 and within a minute or suitably climbs over 2500.. It is supervision smooth though, just showing off innovative than it should be. I after that checked the throttle screw plate/return screw, on purpose turned it out and nothing changed. put it back to exactly where it was. No vacuum leak sounds and all connections verified. I setting good not quite them as I've been in there a bunch of times..

taking into account I begin the car, the engine surges happening between 1200 and 2000 rpm assist and forth. I changed the IAC and the TPS in the same way as no alter in symptoms. I have noticed that several Lexus SC's have this thesame issue. Prior to this I would have to familiarize the idle enthusiasm screw to degrade the rpm and it would retain for a while. Now, the engine is continuously surging to the tapering off where I cannot steer it for terror of broken to the drive train. Any experienced solution?

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