My 92 Cavalier RS won't start. Put in a brand new fuel filter, old one spit out black gas. Checked the timing, spark, and compression, compression was at 125 at the weakest and round 165 at the best and 145 for the other 2 I think. I don't know about fuell pressure yet but should have that tested by tuesday at the latest. We sprayed some starter fluid in it while cranking and still nothing happened. When it first died, I was driving and it shut off and wouldnt start right away. About 5 minutes later it would start but died when it got revved a little bit, but started back up and seemed to be fine later on. Later when i left work, got a few blocks away and it died, same thing. Next day it backfiered a few times and now it just cranks but wont fire. It is the 2.2L ad has 200k on it and I cant afford a new car. Any ideas would be appreciated