how about a 4.6 tbird

[lx5091]

hello

my sister has a '96 tbird with the 4.6
i just talked to her on the phone, it's acting up, engine light is on and it just doesn't perform the same, little less power and not as much pickup.
she said her mechanic said that the egr comes up, but he doesn't think that's it, that something else is triggering that. any ideas?
maybe 6 months ago she had the iab replaced because it had a crack in it. don't know if that makes a difference.
thanks in advance for any suggestions.