e21 Urgent Advise Carb or Engine Prob?

[kuchor kudir]

haiii.........
aku budak br kt cni........
aku pkai kete bmw e21 single headlight.......316L punyer
leh r tukar2 pendapat..........

 

[beemer04]

Car running good however there are still intermittent erratic idling when the engine is hot, I'm planning to send the M1 to check next week, my car has visible rust, any leads on good welder in KL or PJ?