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96 960 surging problem S90-V90

You have a vacuum leak for sure--just where it is --is the problem.
If the intake gasket was replaced--it probably was replaced with the updated green gasket--they seem to last forever---I would take the time to remove the throttle body--replace the gasket there--replace all of your vacuum hose's
don't just inspect them--junk the old ones and get new. The vacuum tree that is locted on the intake where all the vac lines run too--there's a 10mm bolt holding that onto the intake--remove the bolt and remove the vacuum tree--there is an 0 ring there--you can replace it or do what I did--use sensor safe gasket sealer on it and plug it back in--then wait till the next AM before starting her up again-next is the air box--there's a temp stat there that controls cold and hot air coming into the engine--fix that stat to where there is just cold air coming in--do away with that ,it's nothing but a problem-you do those things and I belive you'll have her back in shape






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