ZZTop

1996 GT 4.6l cranks but intermittent starting. Just replaced fuel pump, started a couple times testing fuel pressure and ran fine. Drove it for a bit and parked. 15 minutes later it cranked but no start, no spark. Has had same issue before and had to replace crank sensor. This will be the fourth crank sensor in less than 2 years. Any ideas or suggestions would be much appreciated.