Can you engage the clutch in 1st and roll away from a stop with no accelerator pedal?

Correct me if I'm wrong...backfiring is most often related to a lean condition. Ergo, your [28-yo OE?] fuel pumps could be coming to the end of their useful lives. Each has a factory flow rate specification, which others here probably know off the top of their head, that can be tested/measured.

Something else to consider. You mentioned a new CDI and coil...how old are your plugs and wires? I've observed off the line hesitation/bucking in other cars from nothing other than worn plugs.

 

Thanks for all the replies and help. I finally have it fixed. Was able to finally locate a new long green wire(from 928RUS). I replaced the entire distributor wire back to the CDI and now she runs perfectly. Again, appreciate all the help and advice. Awesome forum.

 

Glad u got it fixed, I was thinking fuel pumps too.
C

 

The end of an epic long story. Good job narrowing it down and fixing it. You had some weird mo-jo going on and attacked each in a logical fashion. Happy for you, now go out and rod the **** out'a her!

 

Thanks guys. Cost me more than anticipated to resolve the issue but that is life with a 930. Worth every penny!