Identifying mapping issue or problem else where

Hi there!

I have a 16v kr running an old emerald ecu. It's suffering from spluttering between 3 and 4000rpm and holding the revs high up in the Rev range it sounds like it's missing but on wot it pulls well and clean all the way through.

I've changed the plugs and temp sensor, it has improved slightly.

Is there a way I could identify if it was down to the map?

 

Has it always done it on the same map?

 

Is it running k jet or throttle bodies etc some more info will help tomstart us off

 

I've not had it long I brought the set up. It's on an old emerald ecu, throttle bodies, cams etc

 

Needs looking at in person.
Symptoms as you describe it can be anything.