1989 rs w/ lo3

I hate to write a book but its been a rough few months and Im going to try to mention everything in case it adds up to anyone.
First to radiator blew.14 years of crud decided to break looseLuckily I was pulling into my driveway when it went.I replaced the rad and while I was at it replaced the thermostat w/ a 180 degree one.
About the same time I noticed the tach would jump a little as I cruise.Occasionally you could feel the surge too.Thinking it was bad gas I added a fuel treatment.It worked for a few days then started surging again.A tune up was done.The plugs were changed to rapidfires and the distributor and rotor changed to MSD. Again it ran better a day or two then started surging again.
One day at a light it felt reeeeally rough.As I started moving I heard a "pow" from under the hood that sounded like a BB gun.When I got home I checked it out and found a vacuum cap had come off(shot off?).I replaced it but the car still ran rough.Its gradually become worse to the point I can feel it get rough and "drag"(kinda like when you drive through deep water"and then it will let off a massive backfire from under the hood.It will do this 3-4 time between home and work(about15 miles).
Ive checked the aldl and had a code 32(egr).I replaced the EGR and noticed the same vacuum cap from before was off again.This time I dabbed silicone on the hose first(come off now!!! )Anyway even with the new EGR when I test drove it I still ran rough and backfired. And yes,i disconnected the battery to reset the comp.

Any ideas?I hope to have it running for the F-body gathering in Bowling Green next weekend

 

Have you checked your timing since the new dizzy was put in?

 

Ive messed with it more and this is what I found...

1)I was running rich because of a bad MAP sensor.For some reason it never blew a code
2)My timing WAS off...bad news is my 14 yr old timing chain is about kaput.Good news is while Im in da hood I'm doing the lt1 cam swap!