If your ECM has a lifetime warranty trade it out to eliminate it as a possibility.
Check all of your wiring harnesses as well.
Any KOEO codes?
Scotty J. "AKA" The "Mad Porter"
"EMC 2006" 3rd place finisher
Ported BBF iron head specialist
& Aluminum heads from all sources.
Custom ground cams
See our products in the Vendor for sale section
Customized crate engines
"Parkland Performance Auto Machine
" Formerly RHP