When i give it gas on the take off it cuts out sort of like a misfire or something already replaced fuel filter cleaned out the throttle body. Could the timeing be off
The Vortec 4.3 liter V6 is notorious for problems with the fuel injector.One injector solenoid feeds all 6 injector nozzles,and sometimes one whole side of the engine will not get any fuel.See if you can smooth out the engine by spraying some starting fluid into the throttle body(remove the rubber hose from the throttle body).If this doesn't seem to make a difference,you may just be dealing with an ignition problem(cap/rotor/wires/carbon tracks on the spark plug insulators).
SOURCE: wont start has fuel and has spark
RC ralston
Your problem is a leak in the cpi pletium most likely the pressure line has a leak
had same problem with mine $45.00 PRESSURE LINE KIT AND $15.00 GASKET FOR PLETIUM and 2 hours labor problem sovled.
You can remove vortec cover and remove air regulator to look inside pletium. I had gas vapor on driver side . that is where fuel lines are. fuel regulator is on passenger side. turn key on and look in hole and see where fuel is spraying. taking pletium off you can again turn key on and make sure where fuel is coming from.
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If it only happens at a certain point in the throttle travel, it may be a bad TPS. You would need a computer to confirm loss of signal, but that is what it sounds like.
SOURCE: 1994 chevy c1500 4.3 lt v6...the truck cranks but runs with a hea
jumped time or burnt valve
SOURCE: I own a 2000 chevy blazer with a 4.3 v6 vortec. It
did you check power and ground at the fuel pump connector?there should be power at two wires at the connector,one should have constant power with the key on and thats for your fuel gage,the other power wire should have it only when cranking or for about 3-5 seconds when the key is turned on,check both of those first and that will let you know that everything is fine all the way forward of that connector,also did u replace just the pump or the whole sending unit?if you just replaced the pump the connector that runs fron the sending unit to the actual pump itself inside the tank also goes bad on this setup too,look for brown or burn marks on the inside of the sending unit where this connector hooks uo,hope this helps
SOURCE: My 4.3 vortec engine in my s10 blazer won't start
try the ignition module. if it is bad it does not send the signal for the the throttle body injectors to spray feul.
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