http://216.230.203.183/RamJet/ramjet.htm

Ramjet scantool link.

This is a must have. Most dealers dont have one and although you cannot tune your ramjet with it you can see what the computer sees and more easily diagnose your problems. I struggled with mine until i realized the computer was not recording run time due to improper power source. It would start fresh everytime and now that its squared away the block learn has much more info from the o2 sensor etc. Its a different motor.

I did talk to a gm tech at the sema show and he said they are working on a faster isc so they dont hunt for idle as much. But as of sema they hadnt fixed that. Mine doesnt seem to hunt that much but you can hear it adjust as it returns to idle.

I wouldnt ever go back to a carb. I am considering a more user friendly ecm though. It drives me nuts that my MEFI4 has all those cabablities that I cannot take advantage of without sending my ecm out to be reprogrammed. I did find a guy who cracked a mefi3 system but he doesnt have a 4 to mess with.

I have the laptop scan tool that Rhinda makes. Its great you can even record with it. You can watch temps etc and see time at particular rpms. Lots of neat stuff. Lots of controlls that are switched off Thanks GM. I think you can track dowmn your problem much faster with this. Mine was obviuos but until i saw from the ecm i wasnt sure what it was. I had asked several experts but they all told me the way it was wired wouldnt matter but guess what they were wrong. I doubt if you have the same problem but with the tool your problem may be as simple as mine was. good luck

oh yeah mine has factory thermostat 195 and runs between 190-200. It may creep to 210 in heavy traffic but cools right back down after it gets moving. The thermostat is critical to the computer i would put the 195 back in it. You can watch the temps with the scan tool as well.