There are 3 needles on a Car engine there should be one right beside the Air filter its called the high speed Dont turn the whole caburator. Just screw the high speed needle (Screw) out about 1 turn.

The Car isnt looseing compression its getting hot after running it and it just feels like it doesnt have any compression its really just becasue its hot from running. Make sure u see Smoke coming out the exaust.