so this is not a particularly reliable or durable model?

I'll post a new thread once I have the car and can fill in details.

I don't think you will find that most folks agree with cuda's thoughts.

The 91 will be the 126 body car. It is generally thought that the 126 cars are very very well built and very reliable when brought up to snuff. The engines are durable and reliable too, but major repairs can be expensive if needed.

The fact that this car has been worked on and diagnosed by amatures just makes the possibility that it is something repairable better.

The fact that it will eventually climb hills at highway speeds makes it seem likely that the problem is not major. I would look first at the throttle linkage to see if it is getting full travel. And if that is good I would look at the fuel supply for restrictions such as a pinched line or plugged filter. And I would look in the tank for debris or foreigh materials.

Good luck.

Tom W

__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

THanks Tom, the additional perspective helps. I thought surely a running 420 with a sound body/interior would be worth troubleshooting a poorly running engine.

David