Engine knock

Item Details
I have a decay 35 with a daedong
There seems to be a new knock as if one of the cylinders is not firing when I first started up in cold weather also blows a little bit of extra smoke out. This goes away after about one minute, but I've never heard it before and I've had the Tractor for six years. Any ideas?
 

Marketplace Items

Log Grapple (A65640)
Log Grapple (A65640)
1995 Peterbilt 379 Tri-Axle Dump Truck (A61573)
1995 Peterbilt 379...
2013 Ford F550 Bucket Truck w/ Jib (A62613)
2013 Ford F550...
2017 FORD F-350 XL 35' NON-INSULATED BUCKET TRK (A59823)
2017 FORD F-350 XL...
(4) Wheels and Tires (A65640)
(4) Wheels and...
Heavy Duty Pipe (A62679)
Heavy Duty Pipe...
 
Top