If it's a hose (in the intake group), go to Riff Raff Diesel and buy their aftermarket hoses. They are the best, I run them exclusively..
Cannot be the cam sensor. It's actually not a cam sensor, the sensor (on the front of the motor, above the harmonic balancer, senses crankshaft rotation and it it fails, the engine won't start, period.
Don't understand the 'hair spray' comment, the hoses clamp on, not stick on.
For any 7.3 of any year, you never want to add a tune of any kind, simply because tuners advance the injection timing and that becomes an issue down the road and finally...
I'd start running a Nano-Borate additive in the engine oil. The injsecotrs in a HEUI engine suffer from sticky spool valves (called 'stiction' and a super lubricant like Nano-Borate, eliminates that sticky condition plus the motor runs quieter and you get better fuel mileage and starts easier cold.
I use Archoil but there are a few on the market.
Been running a 7.3 since 1997 btw.