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engine stumbling in reverse

J

jd9407

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99 suburban, when I hit the pedel in reverse and only in reverse engine drops to 500 or less and smokes black. This has been happing for over a year some what intermittant but more often then not. Has never threwn a code, didn't find anything with the scan-tool pmd replaced twice. any ideas?
 
Heath told me it can be a sign of a weak IP. Don't know if that is the case. Mine does it sometimes when it is hot, but I have a new IP, so my conclusion, for my issue anyway, is ECM issue how ever minor.
 
new ip in 07 not many miles since. Ive been thinking its just a pcm hick-up
 
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