Hi... I have a 95 bbody lt1 transplanted in an 87 Chev crew cab dually along with the 4l60e trans, I freshened it up with a hot cam, 1.6 rr, gasket matched the ports, hooker super comp long tube headers and a tune. It does ok until I let off the gas pedal after a moment of fun and I noticed it bogs for a while when I ease back in the gas, I've done a few EEHack logs and what I see is at 0% tps the timing drops to 1- 9??? degrees of advance and I have seen as much as 20 or so % tps before it climbs to 30 - 31 degrees advance and goes on like it should. I'm not in tune with all this and sort of wish I had left it alone and I'm glad it's not my daily.

I do have a few logs I can post as soon as I can figure the posting part out, any help will be greatly appreciated.

p.s. the tune is a mail order from an interweb tuner.

thanks Mike