Starting Problem

Hi There,

Recently I changed my Cam belt, 20 valves and Tensioner etc.. Before that I don not have car starting problem.
After replacing all the above parts, now it is giving car starting problem. When I asked the mechanic he says that there is throttle problem you need to replace it.
He checked it using some scanner device.

Do I need to replace it or is there any way which I can solve this without replacing.

Your help would be appreciated!

Thanks & Regards
Sathish Pasupulati
South Africa