Nothin but trouble

[jake_33]

hi ive got a 89 chev 4x4 silverado with a 350 and 700r4 trans. Recently it gave me trouble when at driving speed at about 100 km or so it would loose power then i would slack off and it would have power again for a bit so i changed the fuel filter and that did not help thne i changed the in tank pump still did the same and then tonight it died on me and will not start back up does anybody have any suggestions on wats wrong any help would b apreicated

[citydriver]

Do you have fuel pressure?

If you have fuel pressure,check to make sure you have SPARK at the ignition coil and then at the plugs. Also check that the injectors are spraying fuel, if no fuel is spraying from the injectors, unplug the harness from one of the injectors and connect a test light to the wires (ground lead to one wire, and probe to the other wire) You can pick up a fuel injector harness tester(noid light) at your local parts store for under $10. Crank the engine and the light should FLASH, If it does not flash and you have no SPARK then you may have a bad ignition module or distributer pick-up coil................at least thats where I would start. GOOD LUCK

[jake_33]

thanks for the input city driver but ya i dont have fuel foin to my tbi unit i took the back hose of the back of the tbi and when i turn on the key i got nothin and i jus replaced the in tank pump to now iam wondering if there is a sending unit to the in tank pump or where i can get at the wires like where r they located under the hood o and when i put gas down the tbi manualy it runs

[citydriver]

Have you checked the fuel pump relay? It should be under the black plastic cover on the passenger of the side fire-wall. There should be a red wire pigtail with a black plastic end on it coming from the relay harness. When the relay is energized you should have battery voltage(+12v) to that wire............... You can also put a jumper to that wire from the positive(+)batt. terminal to power the fuel pump......

OR you may have gotten a BAD PUMP

[jake_33]

well i jus pulled the tank yesterday and my fuel pump was messed so i put a new one in but the truck still runs like crap like if i jus floor it it guts out untill i let off then work my way to high revs i was told it could b the electronic pick up or the modulator inside the distributer

[2004GMC1500CC]

well i jus pulled the tank yesterday and my fuel pump was messed so i put a new one in but the truck still runs like crap like if i jus floor it it guts out untill i let off then work my way to high revs i was told it could b the electronic pick up or the modulator inside the distributer

 

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What about a plugged cat?