Geez, maybe someone can give me some advice. maybe i'm just cheap and would much rather learn it all myself but my check engine light came on, i checked the code and it came up evaporation emissions system insufficiant. now i figure that has to do with my exhaust one way or another. i checked my header, looked under the car for cracks or anything of that nature but didn't seem to find anything. i am in the military and had one of my mechanics(5 ton truck mech. though...) give me some advice and any ideas before i dish out money i don't have to. he said it could be the cat. converter that's going bad or the sensor inside, but he gave me the stupid idea of running it real quick (like 100 mph) for about 10 mins and then stopping somewhere to see if the cat. converter is red hot. if it is, then i know one or the other. this seems really stupid to me and i just know if i do that i'll blow a head gasket or something...i would much rather fix the prob. then spend more money on the car for stuff i want, not create more probs. has anyone got experiance on this code? appreciate any help i can get.