Help! Can't get truck to shut off!

[daniels84]

Hello, I desperately need some advice as to why my truck keeps dieseling. I have an 86 Sierra Classic 305 4bbl 700R4 with ESC. When I bought the truck it had a Carter carb on it. For one reason or another, I decided to change the fuel system back to Rochester. I located a parts truck that ran well and swapped back everything from it to make my truck stock and I used a buddy's truck as reference to make sure that I was putting the vacumn lines in the right place etc. The problem is that after I did this, the truck would deisel and refuse to shut off unless I disabled the ignition from the distributor. I thought that putting the carter setup back would cure this but, to no avail, it did the same thing. I've tried to retard timing, replaced all the vacumn lines with new ones, lowered the idle on both carbs, and swapped all the various emmision devices that run aff the carb but still the truck refuses to shut off on its own when the vehicle reaches it's normal operatiing temperature (it isn't overheating). The truck ran well before I messed with it and I had no problems with it running wise. I was wondering what could be the culprit- did I somehow stretch the timing chain, could it be someting inside the distributor, or is it something to do with the ESC? Any help would be greatly appreciated as I dearly miss driving my truck. Thanks