I'm new here but not new to the internet so I've done quit a bit of searching already but can't really come up with a answer. I have a 95 Cobra and when I start it in the morning it will start and stumble and die and then fire right back up and goes to about 1500rpms and drops down to about 800 where it sounds like it has a cam(not sure if it does or not). When I take off sometimes it will cut out real fast and then be normal and a few seconds later the cel will come on and the car won't idle and seems like it's lost power. If I don't keep it running it will die but fires right back up. Ran the codes and it was code 158( maf got above 4.5 volts in the last 80 warm up cycles and code 556(primary fuel pump circuit failure). Sometimes the cel will go off and the car idles by itself and runs better but still doesn't seem right. Any ideas?