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the fuel pressure without vacuum is 34psi. and with vacuum 43psi.
If they are vacuum operated then it could be the hubs.
The vacuum line diagram for a 1988 Nissan Z24i can be found in its maintenance manual. It can also be found in the cars repair manual.
On a 19 year old vehicle I would suspect you have a vacuum hose that is leaking. Replace all under hood vacuum hoses.
A vacuum hose diagram for a 1995 Nissan Pathfinder 3.0L V6 can be found in an automotive repair manual. Automotive repair manuals for almost any vehicle can be found for around $25 at automotive parts stores.
You can find a repair CD on many of the auctions. I paid $10.00 bucks for mine.
it is a vacuum leak-replace the vacuum line from the right side along the right front-tiny vacuum line probably split
haynes repair book at auto parts store or get a Nissan truck service manual,check eBay .the dealer wants 75.00.
For vacuum cleaner repair, one can try Sears Home Services, Oreck Store, Sobel Vacuum, Vacuum Doctore KZoo, Capital Vacuum, and S & L Vacuum Cleaner Service Repair and Parts.
go to auto parts store and get a haynes repair manual,about 25.00.
go to autozone site and enter your vehicle info,year,model,engine size,then go to repair guide,u should be able to find or u can buy a haynes repair manual.
The best way to repair a vacuum hose on your Chevrolet is to replace the vacuum hose. The vacuum hose is held in place with a retaining clamp on each end of the hose.