Hey all, My 91 Suburban 1500 (with the 350) has been having issues when I put a load on the engine since I bought it a couple months ago. I put new plugs, wires, cap and rotor on it right after I got it. I found the coil was bad, replaced it and that helped some. I finally got around to checking the timing today and it was about 8 degrees advanced (supposed to be zero according to the sticker, and yes, I disconnected the timing connector). I adjusted it to zero, reconnected the connecter, disconnected the battery for about 20 minutes to reset everything, and now when I start it I get an SES light with a code 42. I was really happy when I found the timing that far off because I thought that might be at least part of my problem, but now this. Any ideas? Thanks for any input, and happy new year to everyone!!