When I leave my truck sit for around 10 hours it will start if i hit the gas but will die as soon as i let up. It will eventaly catch and start running without using the throtle to keep it running. It is a five speed 2.5 four cyl. Sum times it starts and runs fine after sitting a long period. It will start and run fine say if i stop at the store. any ideas.
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If that is carbureted, and has a mechanical fuel pump, try running a length of fuel line from inlet side of pump to a gas can that has fresh, clean fuel, and if it runs good that way, you know problem is most likely in the tank. Removing the tank & cleaning it out is best solution from there. I'd even be tempted to add a small bottle or 2 of Lucas Fuel Sytem Cleaner to first fill in clean tank, just to help clean lines as well as carb.
if it dies in a slow manner like fuel look at fuel pump AND relay. relays will get resistance build up and do weird stuff.Fuel pumps (especially gm)will get thermal breakdown(motor gets hot and decides to quit until cool off) If it is like you turned the key off and it rather violently stops--then that would be the module or coil or some ignition related area.
when i start my 91 s10 blazer it try to stall so i have to give it gas to keep it running then when i leave out of the drive way and go down the road it has problem get the right amountof gas to go but once it hit 60 -70 mile an hour its fine