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This problem is most often caused by a faulty/worn electric fuel pump inside the fuel tank, when you fill it up the gas is very cold, if the pump is worn from years of use the pump can seize up due to the temperature drop and repeated attempts to start are needed to get it going, or it starts and stall several times until it warms back up. Yes I have seen this in the real world, it is not a guess.
there are many things that could cause that from bad gas to weak fuel pump or dirty inline filter or timing chain could be weak or dirty intake or bad catalitic converter or no converter or even a vaccum line off or cracked or even a bad EGR valve so you see theres alot of things that cause poor exceleration or idle. Hope this was some what helpfull.
look for cracked or soft fuel lines at fuel pump and fuel tank had alot of problems with seeping and cracked fuel lines causing this problem on dodge truck and cadilacs
The crank sensor will cause this problem however, have you done a compression check? Do a compression check on all cylinders if you haven't. If the compression is 0 or low on more than one cylinder then I would look at the timing beltas a problem if the vehicle has over 75,000 miles and has never had the timing belt/chain replaced. That is more likely the problem unless your fuel pump is not powering up, check the fuse it is not uncommon for a new pump to cause an old or weak fuse to blow.
Here is a list of some things that can cause it,
Emmissions system not functioning properly,
Faulty secondary ignition system
Fuel injection system in need of adjustment
Vaccum leak at fuel injectors, around intake manifold, or vaccum hoses
Clogged fuel filter
Weak fuel pump
To test for a vaccum leak, get a can of starting fluid, with the engine running, spray around the intake manifold, the vaccum hoses, connections and fittings, where ever you spray and the engine rev's up a little, you found a leak.
your car is running to rich for some reason.check all of your vaccum lines under the hood for leaks.the rubber vac lines turn hard after many years and crack causing intake leaks wich cause a rich mixture.also a bad mass airflow sensor can cause a rich mixture.in any case this problem must be fixed soon or your catylitic converter will overheat and it will be the next thing needing replaced--jaykra
It sounds like that when they tuned up the vehicle they may have broken a vaccum line on the motor. What you need to do is check all the vaccum lines on the motor and look for one that is off or is still on and has a crack running down the side on it. This happens quite frequently on older vehicled where the lines have dried out from age and you move them and they crack without you even knowing. The other option is that when they tuned the car up they lowered the idle too much and it worked ok while there but in a few days the ports for the idle start to clog back up and then the car stalls at low idle. My bet would be that you have a vaccum line that is either off or cracked. Good Luck, RAC
do you get a spark first then go to the next steep, follow the spark from the coil to the plugs
then check to see if you are getting gas. Take off the fuel line and turn the key,maybe the gas froze too then check to see if the water pump cracked or it there are any cracks in the engine
fuel filter or fuel pump problem or it could be the automatic choke is closed and choking motor make sure choke is plugged in on side of carb start car let it warm up with air breather off watch and see if choke opens up .also you can look down into carb when motoe running crack open throttle and see if it sprays gas into intake if it doesnt could be filter or pump. to check fuel pump remove fuel line from carb insert line into small can or bottle so fuel doesnt run ontop of motor and have someone just bump over starter and see if it pushes fuel out line with a descent amount of pressure check fuel filter.and if all that checks out try looking for vaccum line off to check get a can of either and squirt lightly around vaccum lines and listen for car to idle up if it does bad vaccum line. and also check distributer. but it sounds like it is getting to much gas so i would check choke first..... hope that helps .. and by the way you have a 351 modified 400 wich is 351 m 400.
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