Vacuum induction intake cleaning

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?

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?

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.

I've been under the hood of my fiance's escort too long. Tiny, tiny parts in that car. Now that I've opened the hood I see that the brake booster line would suck a gallon of intake cleaner a second if the motor even ran with it off. That little port over by cylinder #1 looks like a way better idea. My only concern is if the solvent would permeate the entire upper manifold from the side opposite the throttle body. Thanks for the advice and for mentioning the other side of the throttle plate. I normally do that with the oil changes I don't rotate the tires on already. (so every other)

...You know you're going to sit straight up in bed one night three weeks from now and call out the name of that product. If you happen to, give the thread a bump. :)

You're talking about Seafoam.