Hey guys and gals
I am new to this...
I have a 1990 Suburban V2500
I just out a tach on it and I think it idles high
These are all in park
First start up is about 900-1000rpms (no a/c)
Warmed up it has 1100-1200 rpms
I just replaced all the vacuums lines I could visually see
New plugs
New Wires...