ok i have owned my 2210 for about 2 years now and bought it used. i t has had a hard life as it is used daily for my excavating business. to get into tight areas and used at home also. but my issue is it has a white smoke and rough running for ther first minuite or 2 until it comes up to temp then the issue dissapears for a little while. and when it is above 1/2 throttle when it is warm it starts knocking like a rod knock. it only has 458 hours right now and has always been fairly well maintained. would i be along the right lines asuming i have a injector that is sticking shut when cold and sticking upen when at higher rpms? if i am on the right track can someone point me inthe right direction. any help would be greatly apreciated.