I have a 1987 GMC Jimmy fullsize, with a 350 and 700r4. I've had problems with it throwing code 13, and occasionally code 32. I feel there is some connection with the egr and code 13. I have replaced the o2 sensor and the egr. The egr is one of the ones from autozone with the washers. Depending on what washer I have in it seems to effect when it throws the code 13. One size may take 1 mile then another washer may take 30 miles. I'm still swapping them around trying to find one that works best, but have just about given up and resorted to ordering one from GM. I have made 2 runs data logging to try to help pinpoint the problem. I didn't clear the codes before the first run so you can't see when the code 13 came on but it took about 15 miles before it came on. before the second run I adjusted the tps, swapped out to a different size washer in the egr, and unhooked the battery cable for 15 minutes then let it idle for 15 min, then started logging and went for a drive. This time the code 13 came on after about 10 miles. I see no reason for it to throw the code 13 the o2 values look good. Sorry for the long post, any help with this would be greatly appreciated.

first run
http://www.mediafire.com/file/ymmwej...alog3-6-09.xls

second run
http://www.mediafire.com/file/zw1f4i...og03-11-09.xls