My 89 camaro 5.0 TBI starts and idles good. It will not accelerate and acts like its starving for gas. There are no codes showing up.

Question edited for clarity.
Question moved from Computers to model category.

Throttle Position Sensor is the most likely.

https://www.google.com/search?q=1989+chevy+camaro+rs+2.8+no+throttle+response

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/

check fuel pressure TBI injection fuel pressure should be 9 - 13 psi.make sure fuel pressure above 10 psi because throttle body need at least 10 psi. in order to work right.if all is good check see if PCM firing the fuel injectors.go to auto parts store buy noid light.to use noid light you have to disconnect fuel injector electrical connector then plug noid light into fuel injector connector.crank engine watch noid light should blink meaning PCM is firing fuel injectors if noid light steady not blinking PCM not working.if noid light dont light up you have open circuit in the fuel injectors wiring.if check engine light flashing have vechicle code scan.bad tps sensor will also cause problem you are having.

Sounds like the fuel pump is going bad(or in this case,has gone bad). I suggest that you change the fuel pump and use a fuel cleaner in your gas tank as dirty gas may have caused the problem to begin with.

Could be a problem with the pickup coil in the bottom of the distributor if equipped. The pickup coil provides the crank signal for the injectors and ignition module.
Did you clear the code and then 53 came back ?
On most models code 53 means the computer or one of the components is getting over 13 volts.

Use a gage and check proper fuel pressure, with TBI, around 9--13 psi. There probably isn't a Schrader valve, to check fuel pressure tee into supply fuel line. Be aware of possible fuel pressure when taking fuel lines loose.

sounds like spark plug coil is bad. had the same problem on my truck also. check wich cylinder is misfiring and replace the coil and maybe the plug also. if the plug looks good leave it. autozone can give you a read out. when checking the coil, if it has a rust color to it its bad and needs to be replaced. 02 z28

have u changed your fuel filter.

listen to fuel pump w/ key on , if you hear a spraying sound, you may have a split hose in the tank

REPLACE FUEL FILTER THEN FUEL PUMP