'94 S10 CHEV TRUCK

This truck has a 4.3 litre vortec engine. Whenever it has been shut off for a couple days, it would not start unless injector cleaner was sprayed into
the intake. The problem is getting worse and is now hourly. The fuel pump has 50lbs. pressure as soon as the key is turned on. Any suggestions
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The CPI unit needs to be replaced, it is expensive.
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