Quote Originally Posted by Nasty-Z View Post
The calibration from Edelbrock runs the 8 MPFI injectors in a batch fire mode , this setup is not a "true" MPFI setup but rather a small upgrade to get the fuel flow from the factory TBI out of the air stream and directly into the ports. The 16197427 will not support true MPFI.

As I said in my earlier post , I tried to use the factory Edelbrock calibration on both my original 454 and the replacement 502 (509) in the '7427 , It ran OK , but I believe it left a lot on the table with the PCM in the original TBI mode. I switched to PFI mode in the PCM (Jumper mod only , no sense resistor mods) and it runs and idles much better.

Just my experience , the OP states his idles just fine the way it is so he should be good to go.

TOM
By true MPFI, does that mean sequential MPFI versus batch MPFI? Still do not understand from an electronics standpoint why the resistors are removed and a jumpers installed.