1999 Chevrolet Silverado 1500 "checking vacuum leaks 99" Questions

...99 chevy truck has just recently been fixed by a mechanic and had the oxygen sensor, head gasket, tune up, now the check engine light is on again and had it scanned. It states running lean on fuel. ...

vacuum leaks. when you get the first two codes 99% of the time it is a vacuum leak. 1% is the mass air flow meter/sensor. And I don't believe you have one on your truck. to old. Also you have to check

...99 with a 5.7L that seems to run good. I have plenty of power on take off and from part throttle. Problem is, when i get right around cruising speed (50-60mph) I can feel a slight miss or sputter. I ...

...99 gmc 2500 is not working No Heat. Blows really good and has plenty of air but doesn't get hot air. I was thinking that the heater core is plugged. or controls on the dash are not working. I also ...

...99 has the external injectors. If it does the fuel pressure regulator is located on the drivers side of the engine about in the middle of the fuel rail. There will be a small vacuum hose attached to ...

99 or you may have a vacuum leak.                            

...vacuum leak with smoke checker machine, no leaks. I don't understand why it won't set a misfire code. Help thanks, Brad Hi Brad, I ran into the same problem your going thru, swapped cylinder plug and ...

...99 Mits w/ an erratic or rough idle that ever rolled in was a vacuum leak due to cracked intake hose w/ a new MAP sensor or just a new/ map sensor (not properly diagnosed) .It's a vac leak or idle ...

...vacuum leaks. ie, vacuum lines them selves, the rubber tube that runs from the air filter to the throttle body. If it has a plastic intake manifold, possibly the rubber port seal gaskets between it ...

...to stop then about1200.Have replaced tp sensor and iac to no avail.It was what the code reader said. thanks for your help. Check your vacuum lines for leaks. Symptoms suggest vacuum leak. MAP ...