I would like to know if anybody else having problems with the fuel injection on the 502 Ramjet? The first series MEFI-3 was installed on the eary ones like mine. It wont idle and is serching up and down and runs extremely fat. I talked to GM PERFORMANCE and they said send the computor in for re-calibration. They told me I was out of warranty even though it has 218 miles on it, so I sent it in. Still ran the same! So I parked the car untill I could get some answers. Now I found out that the new 502 Ramjet has a new and improved MEFI-4 and that there is a kit to upgrade from MEFI-3 to 4. Nobody at GM told me this as I found this by reading the new GM PERFORMANCE PARTS BOOK It lists for 811 bucks and GM reminded me that I was still out of warranty. So now that I have gone this far why stop now! Well I purchaced the kit and installed it, a new wire harness with 02 sensor and new computor and it idles better but still searches and runs rich. Im not very happy about it and about to throw a carb on it. The car is a 70 Nova SS 502 RJ 400 Turbo ,3000 Stall, GearVendor overdrive, and a strange Dana 60 rear end NovanutWayne