When the fuel gauge was bouncing I replaced it with a new gauge and after of couple of fills at BP it started again. Changed gas about a month ago bouncing decreased. The spark plugs I replaced were Bosch Heavy Duty (HDCO).
Zorin pointed out to check the output of diagnostic port. Where is this located? It could be a lean mixture at startup since it hiccups a little when starting then idels fine. It's just the seems like if it has the right amount of fuel when starting then it won't die.
I don't plan to continue spending money at parts (e.g. fuel injectors) but I guess it's fun when you work on a car and replace old items with new it gives a great feeling that you accomplished something for a second until you learn that it did not fix the problem.