Technical motor problem multipla 1.6 BiPower 2001

[vukan]

I have problem, multipla 1.6 BiPower in idling no consrtant and small rpm,

problem is standard, carack minfold exaust
look picture

cracked 4 lines

welding
and prepar to montage

 

[SebastianJakobsson]

Does the problem occur on cng, gas or on both?

 

[vukan]

Hi, in idle on CNG is no stabil RPM, very, very small big noise on small rpm, problem is no big, you dismaintance minfold exaust, carfuly velding, and clining vith machine sanding...