Originally Posted by AMS MIKE,Nov 30 2009, 11:48 AM

Injectors are a big issue. If they are large than stock, that COULD be the cause of the issue. EMS is tuned for the larger injectors and the stock ecu cannot. Thats why I wanted to the EMS calibration off the ecu.

here is what i suggest:

1.) identify what injectors are on the car. If they are aftermarket, get stock OEM injectors, 380cc.

2.) take out your spark plugs and get new OEM plugs.

3.) Remove the FMU or do you have a FPR since you keep changing acronyms . FPR is a Fuel Pressure Regulator which adjusts fuel pressure. This will be sitting on your fuel rail and the return line will come off the FPR. IF you have this and a fuel pressure gauge, just set it to stock fuel pressure which is 45 to 52 psi with vacuum plugged in. If you have a FMU, that is a Fuel Management Unit. That unit would be run off the return fuel line and used WITH a FPR. If you have the FMU....REMOVE IT!

good luck!

Originally Posted by vbb,Nov 30 2009, 03:26 PM

I have the FMU... the little blue topped cylindrical thing that comes with the Vortech Supercharger. I don't know why I got caught up saying FPR.

But yes, I'm removing that, going back to stock injectors, and changing the plugs for sure.

Originally Posted by AMS MIKE,Nov 30 2009, 07:17 PM

cool, then report back