So the car is running with a different relay? First problem solved.
For the second problem: Check compression, ignition AND mixture (long 3 mm inhex), set it up correctly, check for ANY air leaks between metering unit and engine (spray brake cleaner or something else everywhere, especially onto rubber parts, hose connectors and onto the gaskets between two parts).
When you've still got problems you'll have to check fuel pressures. And maybe a different set of injectors.
EDIT: Maybe the flap of the metering is stuck a little bit...