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You need to reset the timing using a scan tool. Here's a video on the procedure:
http://www.youtu.be/watch?v=rPlYNtNkI9k&feature=related

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First of all, thank you so much for your reply & sending me that you tube link.
It was helpful,but my next question is : how do I adjust the distributor on this 2001 safari 4.3L when the hold down bolt hole is NOT elongated? In other words, I think I have a non-adjustable distributor. I now have 2 DTC's.... P1345 & P0335
any ideas ?, thanks
-rd-

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If the distributor was removed recently, then likely it was set back off a tooth. If the scanner indicates that it's off, remove it and reset it in the next tooth.

It sounds like you didn't have the code, but after the distributor was removed for another repair, the code showed up, so this scenario is most likely.

If the distributor was not moved recently, the code could be indicating that the timing chain is stretched. Or a worn bushing for the distributor shaft. Here's a link with some more options to check out:
https://www.scantool.net/forum/index.php?topic=1482.0

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