Ihave a 1988dodge b250 tbi it will start but after will start to sag and hesitate sometime seems to run fine but start driving will bog down,hesitate,stumble and die out.....replaced fuel filter and checked fuel pressure ok

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/

Engine bogs down at start-up?? - Team Integra Forums - Team Integra

www.team-integra.net > ... > Technical / Help > Performance

Jan 19, 2003 - 14 posts - ‎10 authors
A few random times when I have started up my car, it seems like it had trouble staying running! It would start up fine, then bog down to barely ...

hard start, engine bogs down - Car Forums and Automotive Chat ...

www.automotiveforums.com > ... > 1st Gen 95-99

I have a 97 Dodge neon that is acting up. When starting, it takes a while to crank over (Longer than it used to). When I try to take off at first, the car bogs down and ..

which engine? 8valve TBI or 16v MPI?
apples and oranges diffr.
no power when.?
car wont move?
car hesitates?
or bog on hills?
or? only at tip-in throttle , if I wait, bit , power comes on strong.

does W.O.T work up hill, flogging the dog>?
yes/no? this is key to cause,

wot means wide open throttle or pedal to dah metal.
this page cover bog, there is misfire page too,

http://www.fixkick.com/power-index.html

Sound's like you might be having a sticking EGR valve. The EGR valve is located on the drivers rear of the engine. Sometimes hesitation is caused by adjustment problems in the TPS (Throttle position sensor). You may have to have a shop put it on the engine analyzer. Hope this helps. Good luck!

I bet it is in your ignition system. Have you changed the plugs or wires in a while?

have your fuel filter and fuel pump checked for pressure. sounds like the pickup sock in the tank is partially clogged.

Distributor get taken out? Sounds like it's one tooth off at the gear between the camshaft and the distributor shaft.

My Car was doing the same and found the solution and some good tips at this website.

http://www.techknowman.com/Dodge%20Neon/Dodge%20Neon.htm

sounds like a bad plug wire, take a squirt bottle while the car is running then spray the wires down they should start arcing, also when you replaced the fuel pump did you replace the fuel filter

Check the air filter hose. My '99 Protege was idling rough and would sometimes shut off. The air filter hose was cracked half way around. I replaced it (easy just loosen two hose clamps and pull out the sensor) and the car is running fine.