I got it connected, The truck talks to the MS and the MS talks to the laptop. That is a long way from where we began. I warmed it up on the stock ECM then switched. I set the TPS. It fires and dies right away. It has cranking RPMs. It has to be getting fuel or it wouldn't fire every time I turn it over. What do I change to keep it going. I'll have help here tomorrow, weather permitting. I have the O2 set for narrow bad because it is the stock '89 GMC. It is using the GM MAP and the MS Map set up for real time BP. It's a start, well near start. \:\) Tom

"I wonder if God created man because he was disappointed in the monkey?" Mark Twain