a lil tip on pass side valve cover removal that works great....
instead of trying the u-joint/socket extension to get to the lower back bolt near the heater box on 94-97 models, go at it with a regular socket & ratchet from the inner fenderwell in between the frame & plastic of the inner well.
Once your arm is snaked up in there its not very far away & very easy to get a ratchet on to loosen & remove with your fingers, the toughest part is the body postion you end up getting into. If you got big meaty arms you may find it a bit tough, so I got the wife to do it for me
Also the kroil is awesome - alot of guys I hear also (but havent tried) recommend Mercury PowerTune outboard engine/carbon cleaner works wonders on getting a carboned up GP out.
I've found that a good hard run with some high egt's for a bit will help clear up some crud on the tips also.
Cheers