I just finished a bunch of mods on my car and now I can't get it to run correctly. When I am driving the car kind of cuts out and then comes back on, the tack bounces around allot. I seems to start happening when I have been driving the car for a while, ~15 min and gets progressively worse. I know its not the ignition control module, just replaced it today and it did not correct the problem. I have also disconnected my MSD digital 6 unit and ran the stock setup, still no effect. If I hold the key in the start position just before the started engages, the problem goes away.

I have changed my cam, head, intake, and swapped in a Manuel (T56) trans. I am still running on the stock 305 TBI auto chip. Also I have not hooked up the speedo yet.

Any Ideas as to what my problem might be

Sorry to post this on two boards, but I am stumped and want to get as many answers as possible.