Looking for some help, any advice welcomed really.

Been trying to get my mates erst going today, it's running efi with L6 cossie management.

The car runs but when you try to drive it the thing stalls, it will rev but stalls under load.

It was working ok before it was taken off the road in november.

The loom was repaired over xmas, new connectors fitted to it. Also a group A coil added.

Checked spark plugs earlier, very black, covered in carbon.

Any ideas on what to check or to try please.

Thank you