After going thru replacing a lot of parts, the Buick Roadster is now very solid and running like new. Answer was the main computer was going bad. Once the Computer was replaced, my Buick Reatta Convertible started to act like any modern fuel-injected car. Good idle, good acceleration, increase in MPG, good hot and cold starts! Now that it is once again in tip-top shape its turns COLD! Thanks for all your help and tips.