On the way home the 89 stang stalled. I got home and replaced the dist. cap and the engine now fired up but the idle surges then the engine stalls. With the module removed, the one you remove to adjust the timing, the engine runs fine. But the moment you reinstall it the engine surges then stalls. Any ideas or help would be appreciated. I replaced the computer still the same problem, I also replaced the dist. and the same problem occurs.