Fuel pressure holds steady at 52 lbs. for about 15 minutes, even after it started missing intermittently. When I shut it off, the pressure dropped to 44 and then actually rose in the first minute back up to about 55 lbs. I suppose from the fuel heating up in the rail? Regardless, it held pressure well after shutoff, lost about a pound and a half in the first 30 minutes. While it was idling, I noticed that it seems to be running rich, judging by the exhaust smell and sooty exhaust tips. I left out a huge detail, the car had been sitting for about 3 weeks. It might be my imagination, but it seems to be taking longer to act up each time I drive it.

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1983 380SL
1995 C280
1995 S500 coupe
1990 Mazda Miata
2004 Suzuki Hayabusa