da_viper_1999

I am new to this forum and am looking for some assistance from people who know what they are talking about. I have a 78 280z and I can't get it to pass smog. It always comes accross too rich i.e. too many CO's. I changed the water temperature sensor after running the tests in my Factory Service Manual and tried again and no good. so I ran some more tests and changed the throttle position sensor and the Mass Air Flow meter and now the car will not run for a long enough period of time for me to get it to the smog shop. I set the timing to 10 btdc and I also did all the tests I could find on my Mass Air Flow meter and everything looks good. The funny thing is when I have the car running it's fine at first, then after it appears to warm up it begins to die. If you diconnect the temp. sensor the car kicks up and runs fine, but you can look at and smell the exhaust and gather that it is running REALLY rich. when you plug the temp. sensor back in it will jump up in rpm for a split second then begin to run crappy again. My Dad and I think it might be the computer is bad? I would appreciate any constructive thoughts. Travis