Hey guys, I have been trying to tune a 408 and the runability just plain sucks.
It is a 408, fast 102, : 242/250 .648"/.648" (with 1.8:1 Rocker
Ratio), 114 LSA
PRC heads
T56
Anyhow, this engine has been dyno tuned by a shop in washington and it put out awesome power, ran great on the dyno.
Problem is now i get it to Montana, It doesnt want to start cold. Idle is all over the place, itll surge. Its almost impossible to start out. No driveability whatsoever. It bucks and jerks due to RPM
Any thoughts on tune and log files?
55chevy408 dtcedit.hpt55coldstart2.hpl55warmdrive.hpl