Could Use Some Help/input

So I bought a 91 LX 5.0 a couple months back. Did regular tune up and cleaning.. Had troubles but most of them got fixed. I am now having trouble with what I believe to either be the TFI module or my msd ignition box. There is currently a Wells tfi on now. When I first noticed a problem was trying to start the car after it was warmed up. I would try try try but it wouldn't turn over. I sit sit sit and get a jump and starts right up, assuming I killed the battery and the TFI cooled off. So I replaced the TFI (with one from LMR) and drive around and car cuts off in middle of the road (pretty embarrassing). Push into a gas station and let sit, and a buddy tells me to hook up stock ignition. Starts right up with no jump. I ordered a "Motorcraft" tfi from rockauto. Same problem except I was able to put the original tfi on right away and stock ignition and fired right up. I'm lost at what to do. Thanks for any help everyone.
 
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Bad grounds, bad PIP sensor and MSD (May Suddenly Die) box are at the top of the list on this one.

1.) Clean all the accessible connections on the ignition system wiring as a simple first step.
2.) Next time it dies, bypass the MSD box.

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3.) If you got this far with no results, the PIP sensor in the distributor is the next suspect. Dump the codes, sometimes a failing PIP sensor will set code 14, The fix for the PIP sensor is usually a reman distributor, since it requires the removal of the distributor gear and a press to get it off.