Hi guys.

So, long story short. I'm helping my uncle (finally) tune his 90 tbi (originally) suburban that he converted to the old edelbrock efi bolt on deal.....like 12 years ago. The guys burned him a like 7 different chips but it never ran well at all. It is a 7747 ecm.

It has the 24 pin uv prom in there. And we are adding the 28 pin eeprom. My questions are these:

How do I keep the info from the current tune so I can modify that one, if it is saved in the 24 pin chip?

Do I have to solder on the new chip holder? I haven't seen it yet, he says it looks like it plugs into the 24 pin chip holder and the 28 pin chip fits into that. He did buy the zif as well.