[brougham]

Manifold air Temp for code 25 is supposed to be for the 5.7L engines only. For the 4100 it's an EST circuit problem. Timing plug disconnected or something else wrong with the ignition system.

 

[brougham]

EST is electronic spark timing or something like that. Other things for that code are supposed to be bad HEI or ECM or loose wires. I guess basically the comptuer can't pick up the ignition system.

I was thinking the same thing as FASSTWOOD that maybe it's the other way around too. But I wouldn't have thought that any of those problems could make other ones come up.