VW running problem
 

i have a problem with my class 5/1600, it isin't a full class 5/1600, it is a stock class 5/1600. the problem is that when we go fast the buggy wants to go off. we don't know if it is a carb problem or it might be the alternator. we already took it to the mecanic and he changed the carburator, which is a 30 pict, he changed the carb like 2 times and it runs the same, we don't know if there might be a problem with the carb or it is the alternator...