Anyone know Holley Commander 950's? programming?

Del,

I was having fuel pressure problems as you experienced however it was on a higher pressure ~50 psi for Mopar 2.2L turbo. I used a stainless steel pressure sensor from digi-key. The part number is MSP3101P4A1-ND. The price has went significantly up since the last time I purchased. I think of it as a tool. It reads up to 100 PSI and puts out a 1 to 4V signal with a 12V supply. I attached it to the fuel rail and data logged the pressure with my EMS. It is a safe way of fuel measurement. No fuel lines in the passenger compartment. I found the problem was in the new fuel pump, it failed when warm due to a leak in the pump output.

Most injection systems regulate fuel pressure with compensation for manifold pressure. This keeps differential pressure at the injectors constant, such that the fuel flow is then consistently metered with "on time". It cuts pressure at idle and increases pressure with boost or WOT. With MAP also logged, it is possible to verify operation of the fuel regulation.

It is possible that the regulator and fuel pressure is fine, but there is a problem in the fuel enrichment settings based on temperature sensors. I have found that the engine coolant sensor is for short term enrichment. It has to do with enrichments for starting and warm up. The fuel map should only be tuned when at normal operating temperature. The intake air temperature sensor is used for air density corrections based on temperature. It is important to have the correct sensor and location. The hotter the air is, the less air and less fuel is needed. It follows the classic equation PV = nRT, T is in degrees Kelvin. There is also the need to limit going too lean, if the temperature gets too high. I clamp at ~95C, and for air cooled engines enrich to cool.