My chevy truck idles fine but bogs down when throttle is pushed. i have plenty of fuel pressure. when i pour some gas in the throttle body it revs fine. what sould this be?

K1500 PICKUP. ? 5.7 TBI. GAS
i will assume eng. compression good and spark good and timed by the book.
it's staving for fuel.!
fuel pressure not at spec,
fuel pressure regulator bad.
injector clogged (injectors screens inside packed)
bad fuel (was bad now bad fuel is in all that path)
MAP sensor bad or clogged up. EGR stuck open
meter mAp pin out,1.5vdc out,keyon to 4.5V WOT (wide open throttle)

we test fuel pressure 3 ways
key pressure
idle
and WOT
the manual covers that, buy the service manual?
so the pressure specs for TBI are at hand./?
there is no fuel rail like MPI so has very odd connections to do pressure tests TBI. (below)
you do know most injectors have 10micron screens inside,and only ultra sonic reverse cleaning cures them right? (or new injectors) I send mine out for pro cleaning, (Usonic)

the hard part of 1995 TBI is getting the TBI specs.
the manuals were 500 pages paper and nobody digitized all page or skipped most the Injection pages.
it is a problem but the used books are sold at EBAY
from GM (real)

rumor has it
"In stock form a tbi operates 11 to 13 psi running a bit higher makes them run better to a point of about 14.5"
the TBI if you look close has a FPR, seen here
it must be good.(diaphragm)
some TBI have 2 injectors, start+idle (and fast run)
as seen here

https://www.rockauto.com/en/catalog/chevrolet,1995,c1500+pickup,5.7l+v8,1031443,fuel+&+air,fuel+injection+pressure+regulator,6124


next up how to read the pressure (tap ports)
I think this is a returnless system (early)
so they make up filter tap point. fuel. or TEE fitting.


https://www.reddit.com/r/MechanicAdvice/comments/10nz5rd/best_way_to_check_fuel_pressure_gm_tbi/

Did you check the spark plugs for condition and gap?

Clean the Throttle Body and MAF sensor.

Or connect it to a Pro grade scan tool computer and read the live data as it bogs down.

Could be loosing power or pulse to the injectors. I would check for power and pulse ground at the injectors and see if you are loosing one or both.

check the air flow meter operation and rangeing

relace the throtle air idle valve.The temp switch will allso cause this problem.

Check the trottle body postioning sensor...

you have to reset base idle see manual at library for procedure

run a presher test on your fuel pump.check your fuel filter. have nice day

Check your fuel pressure it should be between 25-35. If you do not want to test it then just replace it. If you have to spray gas into the throttle body and it runs great when floored then you are not getting sufficent fuel to your engine and that is the fuel pump

your TPS is the fault. The TPS(throttle position sensor) is located on the throttle body and is responsible for your idle speed. when this is faulty the engine speed sensor tells the ecm that the engines is losing rpm and then the ecm tells the fuel pressure regulater to give more fuel so this loads the throttle body up and you basically are flooding the throttle body and that's when ypou get a bog down. change the tps and this will solve it...please rate the solution..........thanks