Hesitation under hard acceleration

[914NNP]

Hey,
I've got a 1973 2.0
I've been working it back into shape. I've worked thru Kjell Nelin's procedure for renewing and testing the fuel injection and I've adjusted the valves and set the dwell and timing.
As a result of these activities I've replaced all five leaky Injectors, the Head Temp. Sensor and Resistor and the Throttle Position Switch. In addition I've cleaned the Throttle Body and checked the Aux. Air Valve.
So it's running pretty good, cold idle at 1000, drops down to 800 as the Aux. Air closes. I do have a bit of an idle oscillation when warm from 800 to 1000 and back. I'm still looking for vacuum leaks.
The better it's run the more I've had a tendency to accelerate quickly. Recently it's begun to stumble under hard acceleration. It's great when your up to speed and at idle. It's not a problem when accelerating normaly but when you put the pedal to the floor it stumbles.
Any suggestions?
Thanks

[Bleyseng]

First thing Iwould check is the timing and the distributor. Sounds like it might be off. It should be 27' BTDC @3500rpms with hose off and plugged. Make sure you have the vacuum adv hose and the retard hose in the right places too. The vac adv is the port that is above the throttle plate and goes the the big silver can on the distributor.
Second is the MPS the right one for your car? It should be a number ending in 037. It is for that year only! It might be that you are running lean so is doesn't have the pick up you are looking for.
What condition are all the hoses on the engine? The big ones on the manifolds to the plenum tend to leak as they get old, so check em out. I use starting fluid to find leaks, spray just a small amount at the areas you think might leak!!! Alot of it will trick you by going into the TB and giving a false rpm increase.
Geoff

[Bleyseng]

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