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Originally Posted by johnschmitt
Hello all. My car's gas mileage has been bordering on "bad" and "this thing must be leaking someplace." In addition, it just idles like garbage. The fuel filter is fairly new (less than 30k) as is the iac valve, and the air filter's on the list. I'm planning on running some kind of fuel system cleaner through my motor (99 malibu, 3.1 V6) via the brake booster vacuum line to clean the intake manifolds, but I'm not sure what to run through it. Anyone done this? Any specific product you would recommended? Anything you wouldn't?
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I'm not sure what product to use, but iv'e done it myself on a mustang i had. But don't remember the product. There is if I'm not mistaken a vacuum port on the left rear of the manifold with a rubber plug on it also. The line to the break booster will create too big of a vacuum leak and might stall the engine. If u do do this, also take off you air inlet hose to the throttle plate and clean it with carb cleaner also, carbon tends to build up on it also.