Behare

The cylinder with the low compression has 30 on it. The car will run down the road for about 10 minutes and then it starts to loose power and backfire.

I also took the oil fill cap off and the engine died so I am assuming that the vacuum is where it should be.

I have a 1976 280 Z. I was running well until I took it to have an oil change. Since then it has not run well at all. I assume that it is just happend at the same time. I have checked the fuel pressure. I have 32 pounds of pressure at the filter both with the engine running and not running. I ran Seafoam through the system and checked the compression. I have 125 to 140 on 5 of the six cylinders. The 6th one has on it. I need to recheck it to make sure that I didn't miss something. I have drained the fuel tank and changed the fuel filter twice since it got. I sat for ten years before I bought it. The car will run until it warms up and then it looses power and backfires. I can only go about 10 mph with the gas pedal all the way down. I disconnected the cold start injector to make sure that it wasn't leaking. I pulled the plugs and the are black and appear to have oil on them. I would appreciate any and all help that I can get. Thanks for your help.