71GMC said:
alright, i have a 1971 gmc pickup, 350 c.i., original Q-Jet, HEI, Electric choke. The truck has new plugs, wires, cap, rotor, coil, and electronic module.
so, on my way back from the gas station, the truck missed and stalled at operating temperature at a 4 way stop. Once it stalls it will start again, but won't stay running for more then 2 or 3 seconds. It has did this twice on me, this time and while on the highway going 55 mph. If you guys could tell me what is wrong with my truck, it would be greatly appreciated.
Thanks for your time - 71GMC
also, sorry for the un-needed extra thread. did not mean to press the button to send it to the board. :/
well, you changed out a ton of spark parts,, when it's hot, I'd test for spark.. first,, just because the module is new doesn't mean much..
if you have spark.. after the 5 seconds of cranking, (you said it'll restart but die in a few seconds) then move to the fuel side
it runs good cold but not hot.. and you asked where the choke is.. so we can go with your somewhat new at this, and thats fine we all started that way..
before we move forward, after you check all the vacuum ports like listed above.. look at the top of the carb, that oval looking flapper over the front two barrels, thats the choke, let it warm up.. with it warm that flapper (the choke) should be open, straight up and down..
let us know if it's opening,, a closed choke on a warm engine will stall..
next up. the q jet, at the fuel line inlet has a fuel filter.. has that ever been changed?
and another tidbit.. the fuel tank, the new ethnol blended fuel.. does a good job of cleaning the fuel tank of years of gunk.. and can clog the sock on the end of the fuel line in the tank.. rust also can get sucked to the sock and slowly starve the engine of fuel..
I'd do this , in this order
1)you didn't tell us, but I'm willing to bet this engine still has it's egr valve..
it's on the intake and looks like a mushroom.. THESE ARE KNOWN TO STICK OPEN, MOST TIMES YOU CAN PUT YOUR FINGERS IN THE UNDERSIDE AND MOVE THE VALVE AND GET IT TO CLOSE.. AND START BACK UP..
I'd when cold, remove the vacuum lin going to this and plug it with a golf tee, or a bolt.. drive around, if the stalling issue goes bye bye the valve is sticking open and needs to be replaced
2) warm it up. when it stalls, check to see if the choke is open,
3)check for spark
4) check the fuel filter inline , at the q jet
5) the old fuel line to the fuel pump, they get old and colapse and the pump can't suck fuel..
6) the intank sock
my bet is on the EGR VALVE sticking open