Valve cover gasket replacement gone wrong!!!

[explodergames]

A friend of mine replaced the valve cover gasket on my 1995 explorer. He claims to have taken it apart and done everything correctly. I DON'T believe him because the truck started and drove before he touched it now it will start up make a hissing noise like and turn off. It sounds like a leak maybe vacuum hose, but it WILL NOT maintain idle. Anyone ever have this problem?

 

[JusTheUsual]

Obviously something he did wrong. Hissing to me would indicate some kind of vacuum

 

[Accarguy]

Make sure that all the vacuum hose(s) are hooked up to the air intake tube (depending on what engine you have).

 

[ranger7ltr]

Hissing...

Big vacuum leak... Is the brake booster vacuum plug in the brake booster???Or the PCV valve line attached to the PCV valve? Those are the 2 lines I can think off that would cause the vacuum leak and the running problems you have...

 

[rb142]

Yup, definitely a big vacuum leak. He probably left a line off somewhere (or broke one).