Start by posting engine numbers from the shroud, either 60100-XXXX or 80100-XXXX. If it's a 3hp it's not a Vacu-Jet. Maybe a Pulsa-Jet.

Either way, only one needle adjustment. Both carbs are high-speed only. No idle mixture adjustment, only idle speed (on the throttle shaft).

Try opening needle 1/2 turn. Next step is to disassemble carb, boil out parts, and replace diaphragm (if Pulsa-Jet).

model #90102 type #0131-01 code #94111703

I stand corrected. You engine does have a Vacu-Jet carb. If you follow the link and enter your model and type number you can get a Parts List in PDF format.

Go to page 6 for an explosion of the carburetor. Remove the Pickup Tube (#612) and clean. It has a check valve and should allow you to suck gently while closing if you blow on the tube. Next remove and clean the parts making up the Needle Valve Assy (#681). Pay particular attention to the small hole in the Needle Seat (#120). When reassembling, initial setting is the screw in Needle (#173) to bottom, and then back out 1 1/2 turns.

Here is a link that might be useful: Briggs Manual Page

i fixed it thanks