I have an 87 Turbo and am in the process of getting it back on the road. It's been sitting for some time getting paint and body work done. I changed all the fluids and drove on the highway for about an hour before the first test. It failed for HC at 3.1133 and CO at 22.7273. I changed the O2 sensor and had a new CAT installed. That took the HC down below the limit but CO shot up to 29.4298. The motor is mostly stock with the exception of 40lb injectors and a chip that I got from Poston 10-15 years ago. I'm getting ready to do some upgrades but just want to get it legal while I approval from the boss. If anyone has any suggestions it would be much appreciated. Or if you know a good shop in the Denver area to take it to. I don't have as much time these days to work on it with a growing family.