RE: setting idle and fuel mixture
YAY!!
Glad to hear everything is working out for you...glad we could help!
As far as the "pinkish bolt" goes...I'm not 100% sure which one you are talking about but I doubt that running it through the tall grass caused the problem....I wouldn't worry about THAT too much unless the grass really bogs the truck down then you are putting extra stress on the clutch and drive train....other than that...it is a pretty normal occurence for some of the screws and stuff to come loose due to vibration and such...it is important to check all screws...bolts and fasteners periodically...like before each run or something like that just to make sure everything is tight...if some of them seem to be a constant nuisance get yourself some loc-tite and coat the threads before putting them back in...that will take care of the problem...
Hope you are having tons of fun with your truck now and if you have any other problems or questions just holler![8D]