V Vice Hunter Guest Mar 28, 2009 #1 How do I retard the timing on my 1994 Chevy Suburban K1500, 5.7 350 4x4? I am failing my emissions test with high NOx and running to lean. Please help, and thank you in advance.
How do I retard the timing on my 1994 Chevy Suburban K1500, 5.7 350 4x4? I am failing my emissions test with high NOx and running to lean. Please help, and thank you in advance.
