i let the engine suck up a little bit threw the brake booster line and it reved by it self, is this normal or does it signal a problem ?

thanks

With that big of a vacuum leak the RPM will be all over, that'* if it even keeps running. I recommend a smaller vacuum line.

so whats one i should use ? one of those on the frot of the engine ?

thanks

One of the smaller ones right up on the throttle body. The brake booster is such a large vacuum line that most of the time the engine simply stalls out.

okay thanks

when i used that line it reved way up

The engine (if running) will be extremely lean.

The spots I suggest are
NA - on the back of the intake manifold there is a smaller tube on the fitting where the brake booster meets the manifold. This is an HVAC line and will not hurt anything.

SC - This requires about 18inches of vacuum line. The tube under the SC snout where it goes in for the vacuum. Be wary and careful of the belts with the line. Reason behind this choice is the rotor coating may be peeled by Seafoam, I have not tested this to check.

this work on an N/A engine https://www.gmforum.com/normal-maintainence-138/sea-foam-procedure-283274/

I used the brake booster line, no problems from it. Revved a little, but as long as the pour was very slow it didn't die out.

I used a small line for mine, don't remember which one though. Sucked the can up pretty fast with no drama, and very little smoke. I thought it had failed. I shut the car off for 15 minutes, and then started it up. It was then I knew the stuff did something. I had to fight the car to get it started, then I had to fight my neighbors off because I was smoking them out. Did I mention traffic was getting upset because I was smoking up a storm? My car really needed it when I did it.