Hi all, Happy New Year.

I own a 84 vette with 48000 miles. It runs great, at idle (6000rpm) I see the dash lights dim and brighten a bit. Is this normal? What can cause it?

I would like to improve horsepower and performance and read an article on this forum on disconnecting a vacuum line plugging it etc. and now can't find the article, does anyone know how to do this?
What other low cost ideas ( under $300.00) does anyone have to increase horsepower.

Appreciate any help, ideas, and suggestions.
Thanks