emissions

The time has come again for the annual test on my 1994 XJ. Last year it just squeaked through by 0.1%. This year I feel that it might not make it at all. Can anyone suggest ways that will cut the emissions. I have tried all sorts with little success, so ANY SUGGESTIONS will be welcome. Just...

​Help!! My 2005 Jeep Grand Cherokee failed its emissions test back in November and I need to get it registered proper!!! My mechanic friend has checked the computer with his OBD2 meter and told me that it wasn't registering at level 1 and that I would have to put some miles on the engine to...