I finally got my 4cyl conversion car running. Its a 93. It has a 306 with 11.1 compression GT40 heads X cam GT40 intake, MSD 6al, shorty headers and full exhaust. It is running on the stock 8cyl computer. The car runs good, idles a little rough when its cold but clears up. I have the timing at 10 degrees, I figure I could go to 12 or 14. I have no egr or smog stuff and no cats. I keep getting the ses light and I'm almost positive that it has to do with the egr stuff. Would this car benefit from a tune or chip? I've been reading about the tweecer, etc. But then I also read that you can just use a timing light, adjustable fuel pressure regulator and just play and go. I have no plans of a blower or nitrious on this car. Its just a weekend car. What do you guys think?