Re: emmisions fail
I used the emissions improving stuff in the silver bottle. I pass ever time w/ it. My Jeep was always borderline otherwise. Other ideas: over drive the air pump by swaping around the belts, premium gas, tune up, set timing to specs, set manifold idle vaccuum to max using mixture screws and richen 1/2 turn, thicker oil so less cylinder and valve stem oil blow by, new and or larger or piggy back cat converter(s), re-install air injection system, verify vaccuum hoses correct and working - I failed when my power brake booster diaphram had a small leak. That was tough to catch since I didn't notice the braking power decrease of the booster. Good luck.