Car seems to be flooding or starving of fuel. iv replaced the machanical fuel pump and fuel filter. When i open the throttle it splutters but if i feed it very slowly it runs fine

It sounds like it could be time for a carb rebuild. The float could be sticking, it sounds like it is starving for fuel. Be sure to check all your vacuum lines too. This is more for fuel injected engines but I would try Techron fuel treatment available at most parts stores. I usually don't believe in any of these products but have actually had good luck with Techron. You would probably need the smaller of the two sizes available. It's worth a try.