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Engine Surging With A/c On


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New to the land of SC's, recently purchased a 92 SC400 with 100k and have all of the classic issues IE lower control arms, ect. but there is a problem that I could use some expertise. Car runs great until I crank up the A/C. Car seems to run fine for awhile but then she starts surging even on the highway. Turn off the A/C and it stops surging. Car had 100k trip through a Lexus dealership and a tuneup was performed. I just changed the fuel filter as well to no avail. Anybody run into this....Thanks

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