My '04 Z71 has recently become an issue magnet. It has been sending messages about ABS, Service 4WD & Service Tire Monitor right on start up, ABS chimes & flashes as soon as leaving parking space. Within a week it has developed a raw fuel smell and fuel mileage has gone down considerably. One issue that I've been working with is an oil leak that I haven't been able to locate, one thought was that it was the oil pan gasket but that was replaced however another shop seems to think that the pan bolts are stripped. Where do I begin with getting these repairs done and/or is it worth my time to get them done???