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LS 0181158

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  1. I recently purchased a 1993 LS 400 with 204K miles. The car usually drives fine--when it does it is actually the quietest, smoothest, most solid car I've ever driven. One would think the car doesn't even have 100K given how well it normally drives. There are no warning lights when it drives this way. However, since the beginning, there has been an issue with the check engine light illuminating and the revs fluctuating violently as the light flickers on and off. The car naturally loses power as well. When this is happening, taking your foot off the gas (especially at low speeds) will result in stalling. The car will restart, but it sometimes must crank for a few seconds, and the engine will stall immediately unless you keep your foot on the gas to "catch" the revs when the engine fires. Mind, this problem only happened occasionally, and letting the car sit would usually make it go away. I took the car to a Lindsay Lexus in Alexandria, VA, and they charged me $111 to tell me that the problem related to the mass air flow sensor--a $1,100 part according to them. I ordered the part (with a 90-day warranty) from a junkyard for $165 and installed it. I disconnected the battery and pulled the EFI fuse as well. Following this, the car idled smoothly for 15 minutes with no check engine light, and then it cut off. I've since found that several hose clamps on the air passageway to the engine were loose. That once again cured the problem only temporarily. Last night I replaced the air filter, which was pretty dirty. So far the car has run fine, except for a less-than-1-minute period on the highway at 70 mph when the issue reoccured, then went away. I'm all out of moves here--can anyone think of other things to check? I feel like it's got to be another sensor somewhere, the way the problem comes and goes randomly, with no apparent "trigger". Thanks in advance for your thoughts.
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