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Your fuel pressure should be between 48-50psi. I think your combination Fuel Filter/Regulator is clogged. Too much fuel pressure can be just as bad as not enough. You may have more than one issue though. You mentioned that while slowing down or traveling over bumpy roads, the truck "goes dead". This symptom sounds more electrical than mechanical. I might start by looking scanning for codes. See if there is anything in the history or current. A loose or faulty wire, loose or corroded connector, ground or worn component could cause your truck to loose power. This trick doesn't help everyone but it takes a second to find out. If you suspect a faulty TPS, depress the gas pedal .5-1" and try to start the engine. If it starts with it feathered but dies when you release the pedal or wont start with the pedal released. Then take a closer look at that connector and sensor. Please let me know if there is anything else. Good Luck.
clearly sounds like fuel starvation, I would be looking at the throttle body, they need servicing every couple of years, they fill up with like grease and block tick over hole.....
I'd be checking the throttle linkage stop on the throttle body/carb. Sounds like the throttle plates are closing off completely when you let off the pedal. Throtlle adjustment screw may have just backed out also.
I have a 1992 Isuzu Rodio 3.1 injectors not working; but if i put gas in the throttle body it will start up and run. but while driving it down the street it will die and not re-start, until i put gas in the throttle body. the nod light does not work when it wont start. please can you help me with this problem, i have put a new fuel pump in it and two new injectors.
Still sounds fuel related to me. Getting minimal fuel enough to start & or rev, but not maintaining proper pressure required. Try this. Get a can of WD-40 ready, remove air intake hose at throttle body. Start car & when it starts to begin to die, spray some WD-40 into front of throttle body & see if engine continues to run, as long as you keep giving it squirts of 1-2 seconds. If it does, change fuel filter first, but be prepared to do pump too. If you can get a fuel pressure test done on it, that would be even better. Let me know what happens.
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