i dont know about coporator
now considering carburator, it is never repaired or fixed, company doesnt say to repair it. they ask to change it after some time. the company tuned the carburator is best and no mechanic can do the same tuning.
change your carburator and never let any mechanic open it. never get it tuned. just change the plugs and it is tuned.
mechanics use to get more money by telling such things, these things company never mentioned, if you have maual of your car, kindly read it thoroghly, read when to change timing belt, engine oil, air filter, fuel filter and carburator changed.
now stop wasting money on it and get a new carburator fix it and your car will be smooth again.
now about the opened pipes get them fixed by them.