Hey guys,
The Edelbrock MPFI on my new Vortec headed ram jet cammed 355 has 2000 miles on it best of 13.5 mpg. My biggest complaint is a warm engine rough idle, feels like a misfire, I assure you, the ignition system is twice overhauled even added a crane ignition box. Also @1700 rpm I get a strange miss in the engine which clears up @2000 rpm. I measured fp=42psi, injector resistance is 17.9 each. So is this a byproduct of trying to run MPFI from a TBI ecm $od mask? I read in other posts the injectors are wired to one driver, not in my app, Edelbrock instructed me to wire each injector wire to one bank each. Also a warm restart feels loaded up, flooded. I have the .bin if anyone thinks they can take a look and come up something. I'm ready to add another ecm to control the fueling and keep the other for the trans.

 

Talk to HaulinA$$ and see if he is up on his feet well enough to "FIX" your PCM for you. He has a truck that is running the $OD setup with a TPI on a 305.

The rough idle is due to trying to run MPFI on a TBI style injector firing sequence with minimal changes.

The $OD code will support MPFI (the CPI 4.3), but the injector drivers are the limiting factor. After he "fixes" the PCM it will run much better.

 

AHH! There is hope. I will look him up.