Heh, sorry about the partial post hijack, i didn't wanna start a new post for the same subject incase responses relate to both.

I'm having a check engine light come on too. Only in the last week or so, after being on the freeway doing 65-75 for 10 minutes or so, the service engine soon light comes on. It says on until I get off the freeway and slow down for a while. I've heard its emmissions related, but whats teh best approach to take? Ive got the 94 TBI 350. Oh and i just rolled over to 100k if that means anything. It recently smogged fine (after the guy reset the timing from the retarded state it was in).
THanks!