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Fred's basic's are right. The pump spec is a bit off for the mechanical fuel injection motor. The 220se fuel pump delivers lots and lots of fuel at about 18psi. Though I don't have the specs either. The screen setup in the tank is exactly the same between a fuel injected and carb'd car.
You'll find that 4300 rpm is about the point where the advance weights in the distributor are fully extended. Any chance you recently replaced a screw on the housing ? I used one once that was a bit too long. It tore off a weight. Oops.
Rather than spending time guessing, bring the car to a shop with an engine scope. It will tell you precisely what's wrong.
-CTH
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