hey guys, little help if ya wouldnt mind..

my rd28 1999 - after a melbourne mildura and back trip, is missfiring(?)(not firing) @ about 1500 to 2500 revs it surges a little (govenor? ) on the power loss part of the surge it gurgles and white smoke comes out ( unburnt fuel? govenor is giving out too much fuel?) so im thinking maybe the timing needs to come back a tiny bit or the fuel pump needs attention. why its deided to do this after the trip i dont know... maybe its just fatiged.

any help greatly appreciated

thanks

Tony