Hi... I have a 350 with the Holley 670 CFM TBI unit, and I am getting those error codes now from my computer. I have driven the car about 6500 miles on the new motor before this error occurred.
Is it the TPS or distributor or both? I don't know exactly what to do to remedy it.
Any help would be appreciated!

 

I just get an error 21 now.
Rechecked everything. It must be the TPS on the thing, but how do I adjust it or replace it?

 

21 is the tps, 42 is ignition(EST) related. 43 could be either of the previous two. Normally you get 42 when you disconnect the est bypass to set your timing. The first thing I'd do is reset the tps and reset the codes to see what comes up, then work from there. You should look at the est wiring and possibly replace the control module.