Fabia ECU kit

Greetings to all and 👋

I own a 2003 Skoda fabia 1.4 16v with the BBZ engine manual gearbox

I'm also new to this community,oh and I live in Barbados

I purchased this car 3 years ago, thus is my 2nd fabia, the first being a 2005 model with the said BBZ engine, at present here at home in Barbados there's no longer any representation for Skoda the last set of cars was 2005 both for the Octavia and the fabias, anyhow we move onwards, when I first got it I couldn't understand why on cold start idle it would tremble before smoothening out as the engine reached temperature, earlier this year I took it to get a kube service and change some hardware EGR valve namely, during the scan this code came up "TCM" we figured out that the computer in the car was not the original one and that it was for the automatic version of a similar model I have 2 keys and could not at first figure out why, let's fast forward,found out a few weeks ago as I attended another technician to have a manual computer installed which I am in the process of returning because it's not coding that the second key which is the driving key is part of an ECU kit ( new to me )

The car idles poor, runs very rich underperforms and I do not think the EGR valve works either as a result of this faulty marriage

I started a search for said ECU kits online found a site in Lithuania but they do not ship outside of the European union also tried eBay (us) nothing as yet

Can anyone provide me with the appropriate guidance please,

I know the potential of these cars, and I appreciate them very much just want to get normalcy so I can move on to do other things

I await your kind response