anyone know the main reason that a 13b would have a rough idle and lower than normal vaccum reading on the boost gauge. the engine idles at normal speed and drives fine but idles rough and has low vaccum. ANYONE??

 

One common reason is that the engine has a broken apex seal and needs to be rebuilt... get your compression checked.

 

dido

 

Check your vacuum lines. If one pops off, it can also have those effects.