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I have a 78 GT Coupe and had to give Lucid a thumb up on his post. I have never tried to jump the pumps on that car. I would have never known that there was a difference either.
The car I have is a California car and it has the frequency valve.
I thought you might want to check for this since my car had a badly corroded one, on its underside and inside the cover. I have had this car almost since new and I was surprised how it sneaked up on me.
There is a relay on the driver’s side front fender. It is about one inch square and next to the headlight dipper relay.
When it turns on it connects the valve and 0-2 sensor up after starting. It will crank excessively and run like crap unless it closes.
Since you have too open the throttle wide open, you may want to check the fuel distributor air flow plate that is inside the rubber bellows. It might be fuel gummed or stuck down and dirty. Look for holes in the rubber bellows. Bad clamp up can happen too.
I have always been mindful of keeping good fresh fuel in my car just because it is a mechanical moving flow mixture control system. It has been reliable but then so has the whole car for its almost 300k life. I had the seat redone with the stripe and that is the most I have ever spent on the car, next to the tires.
The paint sucked right off because of the then new two stage paint used. I got rid of the stripes and had “Imron” single stage urethane put on it. Now it’s gone. The total paint job back then was 500 bucks. Those days are gone! That stuff is over $300 a gallon the last I checked.
Any who, good luck and keep us posted on things you find!
Phil
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