Here is a good one...
 

Symtoms
1970 chevelle street strip car (runs hi 9's low 10's)
Hard to start intermittently and just recently (yesterday) while driving on the street and hitting it hard from a roll the car or from a stand still would run great and than shut off.
I know not enought info.
Any way I found the racing /emergency switch mounted on my fiberglass bumper was failing at high current situations. I have an electric fuel pump on the car and it always worked except when trying to start. I know it did not seem tough, butg this one had me going awhile

Bad ground