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boost Surging

out driving last night and on acceleration no matter how slight the car was surging as though the fuel was cuttihg in and out. i noticed that the apc gauge was well in the green (about one third back from the yellow) at idle and on average didn't go past midway in the yellow unless i was heavy with the throttle and then it went just into the solid red. but not for long (about 1 second or so) as the things would die down quite dramatically and then really fire away and then die again and so on could this be a leak somewhere in either the vac or pressure sides of the turbo. at full throttle it's like driving with one foot on the break and the other on the throttle and alternating with great gusto! talk about kangaroo hop.
 
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