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hmmmmmm (non mustang)

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My truck is giving me fits. I had a problem getting it started and I posted on that. well, I got it running, but it runs real weird. With the vac. adv hooked up it runs real nice. W/O it it just runs. When I remove the vac. adv and set the timing at about 6deg BTDC it idles at a steady 500 rpm and stalls if you try to give it alittle gas to bring the idle up. W/ the vac adv it idles smoothly at 750-800 RPM and overall runs real nice. I checked the timing w/ the vac. hooked up and it was at 22 deg BTDC! Funny thin is there's never any hint of spark knock. I can run it at 600 rpm in top gear and it runs great, no pinging at all. Any ideas as to what's going on here?

You can never have too much power, just not enough traction.