I'm thinking you're right about a clog somewhere. Even with the two new fuel pumps and fuel filter the fuel pumps are noisy sometimes. They get very noisy just before the car stalls.
So I drained the tank and added 5gal of fresh fuel with a bottle of redline fuel system cleaner. Would this be a heavy dose? It doesn't run as long as it did before maybe 5 min. Perhaps some varnish is being dislodged? I hope this doesn't kill my two new fuel pumps.
Air flap moves with slight resistance unless car is just be run then it is much harder to push down. Any ideas?