83SC CIS help needed

[Flagstaff_911SC]

I recently replaced my fuel pump on my '83SC and had trouble getting it to start and run. It would start and within a few seconds would die, you could smell the fuel like it was flooded. After letting it sit for about a week, it seemed to correct it self. I got it to start, it really blew some black smoke for a few minutes and now the next problem:

Now (cold start) I can get it to start and idle but it is slow to rev and I can hear small backfires (I have a pop-off valve installed).

When the temp goes up after about 2 minutes of idling it will rev freely with no misses/hesitations but it will not idle. I can hold the rev's around 1000 rpm or so and give it gas and it seems to be fine though the rpm range but if I let off the throttle it will just die.

any suggestions on what to start looking at?

thanks

[Gunter]

Is there a new check valve on the new pump? Accumulator getting old? If it does not settle down, a volume check for the pump and/or pressure settings check.