fueling- help

92- 187,000 miles
new injectors,fuel filter, and lift pump last year

2 weeks ago, seemed to crank longer to start
gauge read 5 psi
changed fuel filter, now reads 6 1/2 psi

1 week ago, out on the road, low on power
not even a slight puff of smoke, under rapid acceleration
idle was lower, turn the power screw 1/2 turn
still not running like it use to

Got to where I was going, NO re-start
cracked the lines, flow looked ok
have power to the shut off

after a hour, tried again, started. drove home > lack of power

Went out of town, for a week
truck started right up this morning
has 6 1/2 psi

HELP

Now what

I was going to look at the fuel shut - off solenoid

Then pull the top to look and see if the power screw lever is cracked/ bending ???
Am I in the right direction???
Thanks
Howard

So it's a no-start while hot scenario?

drove 3 miles - no start
left it
next day, long crank time, but, started
drove 20 miles
turned it off, it sat for an hour, went to leave> no start
after 20 min, messing with it . started. > No power, like it use to run

Just a thought but Check the shutdown lever mechanism.

Also do you know what fuel psi is under load and driving?