My friend has a 93 regal 3.8 when he got it the 1-4 coil pack was bad.
We replaced it it runs better but still not like it should.
When you accelerate it really stumbles badly then straighten out.
the guy he got it from said he had these codes then erased them.
#21
#23
#42
he cleared them
we ran it fo 30 miles and got no codes so i have no idea where to start.
Thanks for the help
Tinner