96 Del Sol Too Lean error code help

My 06 DEL SOL has been coming up with a check engine light and the
code is Too Lean (Bank 1). I have had no O2 sensor errors however.
I have a KM intake installed for over a year. filter is ok.
I pulled and replaced the plugs which were VERY covered by black soot
and burnt. I've pulled and checked the injectors visually which don't
appear bad. They measure 14.2 Ohms and click like they're supposed
to. I could not find a inline cleaner kit locally or someone who
could clean them.
Any ideas on what could cause this other than the injectors?
Car runs fine after clearing the code for about 30 miles. After the
code comes back it will start to run sluggish when accelerating. When
pressing on the gas it will not accelerate very well.
thanks in advance
respond to __nospam

{~._.~}
( Y ) Life is not measured by the number of breaths we take,
()~*~() but by the moments that take our breath away
(_)-(_)

 

One more thing...I put in a new PCV valve. did't help

{~._.~}
( Y ) Life is not measured by the number of breaths we take,
()~*~() but by the moments that take our breath away
(_)-(_)

 

check your fuel filter

 

Sorry, that was the first thing I did....forgot......
also PCV valve and plug wires are good.

{~._.~}
( Y ) Life is not measured by the number of breaths we take,
()~*~() but by the moments that take our breath away
(_)-(_)